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Same oil in motor and tranny

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Do you guys run the same oil in both sections. 

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I run Honda HP4M 10-40 in engine and Honda Red Bottle 85-90w (full liter) in trans. I have run Shell Rotella in engine but it makes me feel better using the HP4M. 

 

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I've used the same oil in both sides (Honda GN4), but as my CRF's have gotten older, I tried the Honda Red Bottle 85-90w in the tranny side to get a little smoother shifting.

I don't notice a big difference though, so I'm going to go back to using the same in both sides as soon as I run out.   My worry is that if a seal goes and oil blows back into the engine side, that's not going to be so great for the engine.

I don't think any real damage would be done as I keep a close eye on things (always check oil level before every ride without fail), but all the same, I'd rather protect the engine as best as possible in case of a seal failure.

I change oil often to (every 10-12 hours) along with the filter each time.

Edited by Jim Dettman
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