Join Date: Jun 2013
Location: Central West NSW, Australia
I really doubt the o-rings are at any risk. Engines have multiple o-ring seals in them, most in contact with the oil. They don't seem to be made of anything different to those I've pulled out of old chains.
As for oil sprinkling, you don't need to flow much oil. You only need to keep a light film of oil on the chain. If it's flinging off all over the place you're generally using too much. The exception is a dirt bike running though water etc.
The only thing I've read about using engine oil is to not use USED engine oil as it can be acidic and the entrained particulates can damage the oiler mechanisms. Some, but not all, oilers can also use automatic transmission fluid.
I have a Tutoro. It's fine with moderate to heavy engine oil and gear oil (I run about 50:50 25W60 engine oil and 80W90 gear oil. It's not a magic formula, it's just what I had laying around) but isn't chemically compatible with auto transmission fluid. I believe Scott Oilers are fine with ATF, but could be wrong. One fill of the tank, about 150mL, will easily last me over 500KM and probably closer to 750KM.
"I've recently come to the realization that true happiness can often be found at the bottom of an empty gas tank" - Prime