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--- cars:oil [2025/03/19 22:53] – [2-stroke vs 4-stroke] adam
+++ cars:oil [2025/12/15 08:00] (current) – external edit 127.0.0.1
@@ Line 19: / Line 19: @@
 **yes**, there is a difference: 2-stroke oil is meant to be mixed with the gasoline and combusted, 4-stroke isn't.
-relevant to me personally: my motorcycle is 4-stroke.
+==== 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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