So I’m about to do the 20hr service on my Yamaha SxS which will be changing engine oil, front/rear diffs and transmission oil. Have been reading a lot of forums and watching YouTube videos on the topic and decided on Valvoline 75w90 which is what one of the videos I watched recommended. However the manual says 80w90 and now I’m starting to wonder if I should go with that, or if the other weight is better, or if I’m overthinking it and it doesn’t really matter as long as the oil is GL-5 rated (which they both are).
It seems to me the 75w90 would be better since it should be thicker and coat better but I could be wrong.
From the manual:
It seems to me the 75w90 would be better since it should be thicker and coat better but I could be wrong.
From the manual:
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