Engine oil trans oil

Thanks Tony! That was the answer I was looking for. Most of my bikes have engine/trans oil mixed together. My buddy's HD has a different primary & trans oil.
Older Nortons have a separate trans with it's own oil. Correct?
 
Kid Thunder said:
Thanks Tony! That was the answer I was looking for. Most of my bikes have engine/trans oil mixed together. My buddy's HD has a different primary & trans oil.
Older Nortons have a separate trans with it's own oil. Correct?
Click to expand...

Yes for sure. The Vintage Commando has a separate trans lube , separate primary and separate engine oil
 
"Same oil. Just separated. See my manuals on oil changes." richard-7 says. TonyA has an other opinion. What's the true?
 
The oil in both engine and gearbox is the same specification and grade, it is just in separate compartments so need to be drained and refilled independently (but at the same time).
 

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