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Old 02-26-2017, 01:45 PM   #24 (permalink)
ThermionicScott
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Quote:
Originally Posted by ProDigit View Post
Generally speaking, 10W30 oil is very similar to regular dino oil.
Any lower first number usually has friction modifiers, mostly synthetic oil found in popular semi synthetic oils sold in the store.
The number after the W, if it's higher than 30, it's usually poly type of chains added to the oil making it thicker, and handle higher heat better. Very few W40 and W50 oils are actual heavy oils without modifiers.
Synthetic oils sometimes give problems with wet clutches.

What I talked about here is just the viscosity and lubrication.
I'm not speaking of additives that serve other purposes, like protect against corrosion, or trapping CO2 gasses and stuff like that.
Then you need to make sure you're using the right terms. "Friction modifiers" are the chemicals that make the oil extra-slippery which allegedly (I don't ride motorcycles) cause trouble for wet clutches. "Viscosity index improvers" and "pour point depressants" are the ones that allow better flow in cold weather while not thinning too much at operating temperatures -- stretching the numbers on either side of the "W".

You seem to be conflating all of those into one group and they aren't the same thing.
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Last edited by ThermionicScott; 02-26-2017 at 03:01 PM..
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