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WHY DOES MY MOTOR OIL LOOK BLACK - Cars & Trucks

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Black engine oil is a sign of old oil...drain and fill including oil filter, and check again...depending on driving habits...change every 3,000 (4 months) for city driving...every 7500 for city/highway or every 4 months...your oil is the "lifeblood" of your motor...also check/change the PCV valve for proper air filtering to your oil...Hope this helps.

Posted on Apr 06, 2015

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Posted on Jan 02, 2017

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K my 460 runs like **** its missing and number one plug was black...i changed wires- plugs -and cap and now runs worse and blowing white and blue smoke....whats wrong with it?


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Where do I add motor oil on a Honda 95 Passport?


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On top of the engine you will find a rectangular aluminum cover (it may be bare aluminum or painted flat black). This cover is about 2 feet long and about 5 inches wide. On the top of this cover you will find a round black plastic cap. The cap may have the word OIL on it, or it may has text describing what type of oil to use. Remove this cap by turning it counter clockwise. Pour the oil into the hole the cap covers.

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1 Answer

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Possible scenarios

1. Oil never changed by shop.

2. Old oil was extremely dirty and when changed (way overdue) the sludge in engine and residual oil darkened the clean oil making it look dirty. If its an issue to you some places offer a motor oil flush service.

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