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Old 02-26-2017, 11:45 AM   #23 (permalink)
ProDigit
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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.
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