Is this oil too thin?

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Originally Posted By: FordCapriDriver
I do have a bottle of Ford 75W90 GL4 oil lying around, but i am rather confused on using it or not, since i have also read a thinner oil should make the synchros function better , since i currently have a slight noise when downshifting from 3rd to 2nd, i think right now it has some sort of 80w90 GL4/GL5 oil in it.



80w90 GL4/5 is very likely to be thicker across the whole temperature range compared to Castrol syntrans mutlivehicle 75w90 GL4. That's the go to oil in our workshop for transmissions, works better than the 75w90 Universal GL4/5 we use for transfer cases and diffs.
 
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