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--- cars:oil [2024/08/22 18:54] – created - external edit 127.0.0.1
+++ cars:oil [2025/03/19 23:13] (current) – adam
@@ Line 14: / Line 14: @@
 the "w" means "winter"...or maybe "warm"... anyway, 10W30 gets a 10 in winter conditions and 30 in warm.
+==== 2-stroke vs 4-stroke ====
+**yes**, there is a difference: 2-stroke oil is meant to be mixed with the gasoline and combusted, 4-stroke isn't.
+==== car vs motorcycle ====
+there **is** a difference - some smaller dirtbikes are 2-stroke, while all passenger cars are 4-stroke. However, even if a motorcycle is 4-stroke (as in the case of the 2024 kawasaki vulcan s abs), what's important is whether the bike has a "wet" or "dry" clutch - some motorcycles (e.g., my vulcan) have a "wet clutch", which just means that the clutch has oil. The same oil as the engine. Car oil has "friction modifiers" - certain additives that help it get better gas mileage and less bad emissions. those additives apparently wreck a motorcycle clutch. So wet clutches use *different* friction modifiers, according to the **JASO MA** standard.
+tl;dr: unfortunately yes, you have to buy separate oil for a car and a bike

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