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When was the last time I changed the oil in my mower?
(lemmy.world)
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this post was submitted on 15 Sep 2024
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Showerthoughts
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A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The most popular seem to be lighthearted clever little truths, hidden in daily life.
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I thought two-stroke engines mix the oil and fuel together? Every time you refuel, you should also be topping up the oil. Am I wrong?
I'm not sure you can even buy a two stroke lawnmower. Snowblower, maybe.
Yes, you need to have oil mixed with the gasoline in a two stroke, because the area under the piston (where the crankshaft is) creates the vacuum on the upstroke to draw in the next fuel charge. Lubrication of the crankshaft bearings, then, must come from oil that is in the gasoline, either by premixing it, or from an oil injection system.
A four stroke, on the other hand, uses the top of the cylinder, above the piston, to draw in the next fuel charge through an intake valve, and the area underneath the piston is bathed with oil. Over time, that oil (including its additives) breaks down and loses its lubricity, and must be changed for fresh oil.
Only for some engines. Make sure you read the manual and the cap.
Depends on the engine. Small 2 strokes usually use premix. Big ones, like on scooters or motorcycles, usually have an oil pump and an oil tank. You add oil every few thousand miles.