Does the Right Oil Matter?

Charlie Admin • 4 February 2026

Does the Right Oil Matter?


Short answer: yes. Very much so.


Recently, we had a John Deere 5720 come into the workshop with a complaint of noisy and ineffective brakes. At first glance, it sounded like a fairly routine brake issue, but as soon as we removed the trumpet housing, the cause became clear almost instantly.


Let’s just say… it didn’t take Sherlock Holmes long to crack this one.


What We Found


On strip-down, we discovered that the friction lining on one of the brake discs had completely separated from the disc itself. With the lining gone, the metal backing plate had been running directly against the brake piston.


The result?

  • Severe scoring to the brake piston
  • Extensive internal damage
  • A braking system that was never going to perform as it should


While we were in there, we also removed the handbrake discs for inspection, and it’s a good job we did. They were well past their best and heading in the same direction.


At this point, the obvious question was why. So, What Caused It?


We can’t say with absolute certainty what caused the failure, but based on what we saw and our experience, we have a very strong suspicion. The wrong oil.


And that got me thinking. 'This would make a good blog case study'. So, here we go…
"Does the right oil really matter?"


Why Oil Choice Is Critical in Modern Tractors


On older machines, oil choice was often a little more forgiving. Today’s tractors are a different story altogether.


Modern tractors like the John Deere 5720 rely on one oil to do multiple jobs, including:


  • Lubricating the transmission
  • Operating the hydraulic system
  • Cooling and protecting internal components
  • Providing correct friction characteristics for wet brakes and clutches


That last point is the key one here.


Wet brake systems are designed to work with oils that contain specific friction modifiers. If the wrong oil is used, even if it’s a “good quality” oil, those friction properties can be completely wrong for the system.


Over time, this can lead to:

  • Brake chatter or noise
  • Reduced braking performance
  • Overheating
  • Premature wear
  • Brake linings breaking down or delaminating (exactly what we saw here)


“But It’s Still Oil, Isn’t It?”


Unfortunately, not all oils are created equal.


Using an oil that almost meets the specification, or is intended for a different application, can slowly cause damage that isn’t immediately obvious. The tractor may continue to work, but internally, things are deteriorating.


By the time symptoms show up, the damage is often already done.


The Cost of Getting It Wrong


In this case, what could have been avoided with the correct oil has resulted in:

  • Brake disc replacement
  • Brake piston damage
  • Additional labour
  • Increased downtime


All of which could have been prevented.


Our Advice


  • Always use the oil specified by the manufacturer
  • If in doubt, ask, don’t guess
  • Be cautious of mixing oils or topping up with “whatever’s to hand”
  • Regular servicing isn’t just about filters, oil choice matters just as much


If you’re unsure what oil your tractor should be running, or you’re experiencing brake noise, chatter, or hydraulic issues, it’s well worth getting it checked sooner rather than later.


Who We Use For Lubricants


At JJ Farm Services, we choose to use Morris Lubricants, a trusted UK oil manufacturer with a long-standing heritage in producing high-quality lubricants.


Morris have been blending and manufacturing oils in the UK for decades, and their products are designed to meet the demands of modern machinery, including tractors with shared transmission, hydraulic, and wet brake systems.


One thing we particularly value is the oil lookup tool on their website (
www.whatoildoineed.com), which is completely dedicated to helping users find the correct oil for: Cars, Trucks, Buses, Tractors, Agricultural machinery, Plant and construction equipment.


It removes the guesswork and ensures the oil being used is exactly what the machine was designed to run.


I’ve also had the privilege of visiting the Morris Lubricants factory in Shrewsbury, where all of their oils are manufactured. Seeing the operation firsthand really reinforces the confidence we have in the product, it’s an impressive setup and a clear demonstration of the standards they work to.


Final Thoughts


So… does the right oil matter? Absolutely!


As this John Deere 5720 proves, oil isn’t just oil, it’s a critical component in keeping modern tractors reliable, safe, and working as they should.


Using the correct specification oil, from a trusted manufacturer, can prevent costly repairs, reduce downtime, and extend the life of your machine.


If you’d like advice on oil choice, servicing, or if you’re experiencing brake noise, chatter, or hydraulic issues, feel free to get in touch. We’re always happy to help keep machines working and avoid costly repairs where possible.

More latest news…

by Charlie Admin 29 June 2026
The JJ Farm Services 2027 Calendar Competition is Now Open! Each year, our calendar celebrates the people, machinery and landscapes that make British farming so special. Following the fantastic response to previous years, we're delighted to announce that the JJ Farm Services 2027 Calendar Competition is now open, and we'd love to showcase your photographs. Whether you've captured a spectacular sunrise over the fields, harvest in full swing, livestock in the countryside, or your favourite tractor hard at work, we want to see the moments that tell the story of farming throughout the seasons. What we're looking for We're inviting photographs that capture the best of agriculture, including: Tractors and agricultural machinery Cultivation, drilling and harvesting Livestock and animal husbandry Grassland and forage operations Rural landscapes and seasonal scenery Everyday life on the farm Those special moments that showcase the farming community Whether you're a professional photographer or simply enjoy taking photos while out on the farm, everyone is welcome to enter. What's in it for you? If your photograph is selected, you will: Feature in the JJ Farm Services 2027 Calendar Be credited alongside your photograph Receive a thank-you gift from JJ Farm Services Our calendar is enjoyed by customers throughout the year, making it a fantastic opportunity to have your photography seen across the farming community. How to enter Email your photographs to: đź“§ sales@jjfarm.co.uk To help us identify your entry, please include: Your name A contact telephone number or email address Please send the highest-resolution version of your photograph whenever possible, as this helps ensure the best print quality in the calendar. Competition closing date Entries close on Wednesday 30th September 2026. We'll contact successful entrants once the judging has been completed. Thank you to everyone who enters. We look forward to seeing the fantastic photographs that showcase farming at its very best. Competition Terms & Conditions Please read the Competition Terms & Conditions below before entering. By submitting your photographs, you confirm that you have read and accepted these Terms & Conditions. JJ Farm Services 2027 Calendar Competition – Terms & Conditions Thank you for entering the JJ Farm Services 2027 Calendar Competition. By submitting an entry, you agree to the following Terms & Conditions. 1. Competition Entry The competition is open to all amateur and professional photographers. There is no entry fee. Entrants may submit multiple photographs. All entries must be received by 11:59 pm on 30th September 2026. Late entries may not be considered. 2. Photograph Requirements Photographs must be the original work of the entrant. Images should be of high quality and suitable for print. We welcome photographs featuring farming, agricultural machinery, livestock, rural landscapes, crops, and agricultural life. Minor editing (such as cropping, colour correction and exposure adjustments) is acceptable, provided the image accurately represents the original scene. Images containing offensive, inappropriate or unlawful content will not be accepted. 3. Copyright Copyright remains with the photographer. By entering the competition, you confirm that you own the copyright to each submitted image. 4. Permission to Use Images By entering the competition, you grant JJ Farm Services a non-exclusive, royalty-free, worldwide licence to use submitted photographs for promotional and marketing purposes. This includes, but is not limited to: The JJ Farm Services 2027 Calendar Future JJ Farm Services calendars Social media channels The JJ Farm Services website Printed advertising and promotional literature Exhibitions, trade shows and events Press releases and editorial content promoting JJ Farm Services Your photograph may be resized, cropped or adjusted where necessary for publication. The content of the image will not be materially altered. 5. Photographer Credit Where reasonably possible, JJ Farm Services will credit the photographer whenever a submitted image is used. 6. Permission from Others If your photograph includes identifiable individuals or private property, you confirm that you have obtained any necessary permission for the image to be submitted and used as outlined in these Terms & Conditions. 7. Selection of Images Winning and featured photographs will be selected by JJ Farm Services. The judges' decision is final. No correspondence will be entered into regarding the selection process. 8. Prize Selected photographers will: Have their photograph featured in the JJ Farm Services 2027 Calendar. Be credited alongside their image where possible. Receive a gift from JJ Farm Services. Prizes are non-transferable and cannot be exchanged for cash. 9. Liability Entrants remain responsible for the content of their submissions. JJ Farm Services accepts no responsibility for entries that are lost, delayed, corrupted or otherwise not received due to technical issues. 10. Data Protection Personal information submitted as part of the competition will only be used for the administration of the competition and to contact successful entrants. Your personal information will not be sold to third parties. 11. Changes to the Competition JJ Farm Services reserves the right to amend these Terms & Conditions or cancel the competition where necessary due to circumstances beyond our reasonable control. 12. Contact If you have any questions regarding the competition, please contact: Hannah Stagg đź“§ accounts@jjfarm.co.uk
by Charlie Admin 4 June 2026
Save the Date. Join Us at the Tillage Event 2026 Thursday 10th September 2026 Hosted by Calmsden Farms We're pleased to announce that JJ Farm Services will be attending the Calmsden Tillage Event on Thursday, 10th September 2026, at Calmsden Farms, near Cirencester. The event is organised by the Gloucestershire Root, Fruit & Grain Society (GRFGS), an organisation with a long history of supporting agriculture across the county through demonstrations, knowledge sharing, and industry events. The annual tillage event brings together farmers, contractors, machinery dealers, and manufacturers for a practical day focused on cultivation, crop establishment, and modern farming techniques. Set in the heart of the Cotswolds, the event provides an excellent opportunity to see machinery working in real field conditions, compare different cultivation systems, and speak directly with industry professionals. More information and contact details can be found over on the Gloucestershire Root Fruit & Grain Society website www.grfgs.com Come and Say Hello Our team will be on hand throughout the day to discuss: Agricultural machinery sales Servicing and maintenance Tractor and machinery repairs Parts support Workshop capabilities New and used machinery opportunities Whether you're an existing customer or simply want to learn more about what we do, we'd be delighted to have a chat. Why Attend? Events like this offer a valuable opportunity to: See cultivation equipment working in the field Compare different establishment systems Speak directly with manufacturers and dealers Exchange ideas with fellow farmers and contractors Keep up to date with the latest machinery developments Planning Your Visit 📍 Location: Calmsden Farms, Cirencester, Gloucestershire, GL7 5ET 📅 Date: Thursday 10th September 2026 Gates open at 9:30 am - free admission Working demonstrations starting from 9:30 am through to 4 pm Keep an eye on our social media channels for further updates as the event approaches. We look forward to seeing you there.
by Charlie Admin 22 February 2026
Is there a difference between non-genuine and OEM parts.
by Charlie Admin 29 June 2026
The JJ Farm Services 2027 Calendar Competition is Now Open! Each year, our calendar celebrates the people, machinery and landscapes that make British farming so special. Following the fantastic response to previous years, we're delighted to announce that the JJ Farm Services 2027 Calendar Competition is now open, and we'd love to showcase your photographs. Whether you've captured a spectacular sunrise over the fields, harvest in full swing, livestock in the countryside, or your favourite tractor hard at work, we want to see the moments that tell the story of farming throughout the seasons. What we're looking for We're inviting photographs that capture the best of agriculture, including: Tractors and agricultural machinery Cultivation, drilling and harvesting Livestock and animal husbandry Grassland and forage operations Rural landscapes and seasonal scenery Everyday life on the farm Those special moments that showcase the farming community Whether you're a professional photographer or simply enjoy taking photos while out on the farm, everyone is welcome to enter. What's in it for you? If your photograph is selected, you will: Feature in the JJ Farm Services 2027 Calendar Be credited alongside your photograph Receive a thank-you gift from JJ Farm Services Our calendar is enjoyed by customers throughout the year, making it a fantastic opportunity to have your photography seen across the farming community. How to enter Email your photographs to: đź“§ sales@jjfarm.co.uk To help us identify your entry, please include: Your name A contact telephone number or email address Please send the highest-resolution version of your photograph whenever possible, as this helps ensure the best print quality in the calendar. Competition closing date Entries close on Wednesday 30th September 2026. We'll contact successful entrants once the judging has been completed. Thank you to everyone who enters. We look forward to seeing the fantastic photographs that showcase farming at its very best. Competition Terms & Conditions Please read the Competition Terms & Conditions below before entering. By submitting your photographs, you confirm that you have read and accepted these Terms & Conditions. JJ Farm Services 2027 Calendar Competition – Terms & Conditions Thank you for entering the JJ Farm Services 2027 Calendar Competition. By submitting an entry, you agree to the following Terms & Conditions. 1. Competition Entry The competition is open to all amateur and professional photographers. There is no entry fee. Entrants may submit multiple photographs. All entries must be received by 11:59 pm on 30th September 2026. Late entries may not be considered. 2. Photograph Requirements Photographs must be the original work of the entrant. Images should be of high quality and suitable for print. We welcome photographs featuring farming, agricultural machinery, livestock, rural landscapes, crops, and agricultural life. Minor editing (such as cropping, colour correction and exposure adjustments) is acceptable, provided the image accurately represents the original scene. Images containing offensive, inappropriate or unlawful content will not be accepted. 3. Copyright Copyright remains with the photographer. By entering the competition, you confirm that you own the copyright to each submitted image. 4. Permission to Use Images By entering the competition, you grant JJ Farm Services a non-exclusive, royalty-free, worldwide licence to use submitted photographs for promotional and marketing purposes. This includes, but is not limited to: The JJ Farm Services 2027 Calendar Future JJ Farm Services calendars Social media channels The JJ Farm Services website Printed advertising and promotional literature Exhibitions, trade shows and events Press releases and editorial content promoting JJ Farm Services Your photograph may be resized, cropped or adjusted where necessary for publication. The content of the image will not be materially altered. 5. Photographer Credit Where reasonably possible, JJ Farm Services will credit the photographer whenever a submitted image is used. 6. Permission from Others If your photograph includes identifiable individuals or private property, you confirm that you have obtained any necessary permission for the image to be submitted and used as outlined in these Terms & Conditions. 7. Selection of Images Winning and featured photographs will be selected by JJ Farm Services. The judges' decision is final. No correspondence will be entered into regarding the selection process. 8. Prize Selected photographers will: Have their photograph featured in the JJ Farm Services 2027 Calendar. Be credited alongside their image where possible. Receive a gift from JJ Farm Services. Prizes are non-transferable and cannot be exchanged for cash. 9. Liability Entrants remain responsible for the content of their submissions. JJ Farm Services accepts no responsibility for entries that are lost, delayed, corrupted or otherwise not received due to technical issues. 10. Data Protection Personal information submitted as part of the competition will only be used for the administration of the competition and to contact successful entrants. Your personal information will not be sold to third parties. 11. Changes to the Competition JJ Farm Services reserves the right to amend these Terms & Conditions or cancel the competition where necessary due to circumstances beyond our reasonable control. 12. Contact If you have any questions regarding the competition, please contact: Hannah Stagg đź“§ accounts@jjfarm.co.uk
by Charlie Admin 4 June 2026
Save the Date. Join Us at the Tillage Event 2026 Thursday 10th September 2026 Hosted by Calmsden Farms We're pleased to announce that JJ Farm Services will be attending the Calmsden Tillage Event on Thursday, 10th September 2026, at Calmsden Farms, near Cirencester. The event is organised by the Gloucestershire Root, Fruit & Grain Society (GRFGS), an organisation with a long history of supporting agriculture across the county through demonstrations, knowledge sharing, and industry events. The annual tillage event brings together farmers, contractors, machinery dealers, and manufacturers for a practical day focused on cultivation, crop establishment, and modern farming techniques. Set in the heart of the Cotswolds, the event provides an excellent opportunity to see machinery working in real field conditions, compare different cultivation systems, and speak directly with industry professionals. More information and contact details can be found over on the Gloucestershire Root Fruit & Grain Society website www.grfgs.com Come and Say Hello Our team will be on hand throughout the day to discuss: Agricultural machinery sales Servicing and maintenance Tractor and machinery repairs Parts support Workshop capabilities New and used machinery opportunities Whether you're an existing customer or simply want to learn more about what we do, we'd be delighted to have a chat. Why Attend? Events like this offer a valuable opportunity to: See cultivation equipment working in the field Compare different establishment systems Speak directly with manufacturers and dealers Exchange ideas with fellow farmers and contractors Keep up to date with the latest machinery developments Planning Your Visit 📍 Location: Calmsden Farms, Cirencester, Gloucestershire, GL7 5ET 📅 Date: Thursday 10th September 2026 Gates open at 9:30 am - free admission Working demonstrations starting from 9:30 am through to 4 pm Keep an eye on our social media channels for further updates as the event approaches. We look forward to seeing you there.