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Harley-Davidson Sportster Motorcycles from 1986 to Present.

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Why does my oil light come on when the motor gets warm?

Why does my oil light come on when the motor gets warm?

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You might want to make sure you are using a straight 30w, or heavier, oil and that the oil is not broken down by heat or contaminated by gas/solvent. If it is not the oil itself, then it could be the sensor (hopefully) or some bearing is getting loose enough to impact the oil pressure when everything's warmed up.

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If you are using 20/50 and your oil level is within spec after it has been warmed up then you have an oil pressure issue. For a quick test, with the bike running, look into the oil tank. Do you see air bubbles and the oil moving? Another quick test: Place a pan under the oil filter > remove oil filter > start bike (it'll take 10 sec of run time). Do you see any oil being pumped out from the feed line into where the filter would be?

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Noah is right.

Another possibility is degraded oil and more probable, a worn oil pump.

( a tooth wheel pump )

Change the oil and look carefully for metal-chips.

Check ( by taking it to pieces ) your oil pump then!

Good luck !

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Michael 将永远感激不已
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