Why Using Fully Synthetic Oil in Your Mower Bars & Gearboxes Can Save You from Costly Breakdowns
- Glen @ Taits Rural Ltd
- Aug 13
- 2 min read
When it comes to maintaining your hay mower, bar, and gearbox, most people focus on blades, belts, and bearings — but one of the most critical (and often overlooked) factors in the life of your machine is the oil you put in it.
Recently, we had a real-world reminder of just how much of a difference the right oil can make. One of our mower gearboxes was running hot — really hot — and was on the verge of failure. The oil inside? Standard 80W/90 gear oil.
We drained it out and replaced it with a high-quality fully synthetic 75W/90 gear oil. The result?
The gearbox temperature dropped noticeably.
The overheating stopped.
The machine kept working without further damage.
This isn’t a coincidence — and here’s why.
Why Fully Synthetic Oil Makes a Difference
Better Heat Resistance - Fully synthetic oil is engineered to handle higher operating temperatures without breaking down. This means it keeps lubricating effectively even when your mower is working hard in hot conditions.
Improved Lubrication - Synthetic oil has a more uniform molecular structure, reducing friction between moving parts. Less friction means less heat — and less heat means less wear.
Longer Life Between Changes - Synthetic oils resist oxidation and sludge build-up better than conventional oils, meaning they stay cleaner for longer. This can extend the life of your gearbox and reduce maintenance intervals.
Cold-Start Protection - On cooler mornings, synthetic oils flow better from the start, protecting parts from dry contact when the machine is first switched on.
Real-World Tip from the Workshop
If you’re noticing your mower gearbox or cutter bar running hotter than normal — especially in summer — switching to a fully synthetic oil like 75W/90 might just solve the problem. It could be the difference between a long day in the paddock and a costly breakdown.
Final Word:
The right oil isn’t just a lubricant — it’s cheap insurance against heat, wear, and unexpected downtime. Whether it’s a mower bar, gearbox, or other high-load component, consider upgrading to a fully synthetic oil next time you service your machine.
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