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- - Manual Trans & Diff oil (https://chevroletforum.com/forum/colorado-19/manual-trans-diff-oil-12845/)

hamcginn

January 25th, 2008 3:35 PM

Manual Trans & Diff oil

07 Colorado. The owners manual calls for 75W90 synthetic in the diff, 89021-806(manual trans fluid) in the trans. Am pretty sure the trans fluid is not synthetic. What about using synthetic oil inthe trans.

EvansBlue

January 30th, 2008 7:21 PM

RE: Manual Trans & Diff oil

Most transmission fluid is synthetic now. If it was natural refined oil, it would lose its viscosity over time and not protect as well. Theres also nothing in the Colorado transmission that can really be damaged by using synthetic fluid anyway. I say use it. It shouldn't make much difference either way.

hamcginn

February 5th, 2008 4:57 PM

RE: Manual Trans & Diff oil

Thanks for your thoughts. My main concern is the synchronizers not being able to grab.

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