Is it OK to use 75w140 instead of 80W90?
Is it OK to use 75w140 instead of 80W90? Can I use 75w140 instead of 80w90? Either one is fine. Generally the synthetic 75w-140 is for HD applications such as towing, but it will work fine in any application. What is the difference between 80 90 gear oil and 85 140 gear oil? Which gear oil is thicker, 80W 90 or 85W 140? – Quora. Short answer: 85W140 is thicker. Can you use 85W 140 instead of 75w140? 85w-140 transfers heat MUCH slower (because it flows slower) than 75w-140 causing more heat build-up. 75w-90 is even better and will bring...