Hi All
Just about to refill my (manual gearbox) with oil the transfer case and gearbox side manual says to use the same oil thats in the engine 15/40 engine oil any advice??
isuzurob wrote:Can run 75w/90 but can be hard to select gears when cold, 5w/30, 15w/40, anything really I've tried alsorts even 80w/90 works if that's all you have
geeves wrote:Not quite unfortunately. Modern engine oils have friction modifiers which are great in the engine but dont play nice with syncro rings. It wont damage them if its already in there but when cold hard gear shifts are likely. If its in there and working well dont worry. The 3 options for the gearbox are
A: The cheapest oil of the same viscosity as the engine that you can find. Today that is still better oil than was available when the gearbox was designed.
B: 5 speed gear oil. There are a few brands on the market. Dont worry about the viscosity as gear oil is measured differently
C: Dexron 3 ATF However it likes to find ways out of the box
All the above work. One thing to avoid at all costs is diff oil. Diff oil additives eat brass synchro rings and break down at high temperatures into nasty things
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