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Old 07-29-2017, 10:35 AM   #35 (permalink)
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Originally Posted by diesel_john View Post
What are the pros and cons between hot thick oil and cool thin oil like john deere hy-gard?
Thinner grade oil has the advantage in efficiency, because it has lower viscosity after cold start. This is the most critical moment if we want to improve the efficiency. It takes a lot of time before oil in a gearbox will heat up. Oil aging process is slower with colder oil so the oil doesn't need to be changed as often as hot oil. Also rubber seals will age faster when the temperature is higher.

Hotter oil has one advantage. Moisture in oil will evaporate faster at higher temperatures.

Last edited by NHB; 07-30-2017 at 10:32 AM..
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