How do I fix a oil leak that I cant find where its coming from.

1991 NISSAN 300ZX
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PARKS55
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when the oil leak began there was a lot of black smoke coming from the exhaust The car when started after I clean the spark plugs runs fine for bout half and hour then it starts to sound like it has a miss in the engine then the black smoke comes from the exhaust. what can be the problem with the engine. I bought a new engine seal kit for it and was wondering if changing the seals would fix the problem.
Dec 8, 2011 at 6:29 PM
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JACOBANDNICKOLAS
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Black smoke usually indicates a rich fuel mixture. As far as the oil leak, you can get a dye to add to the oil. Drive the vehicle and then check for the leak with a black light. The dye will glow.
Dec 8, 2011 at 6:35 PM
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DKBLUE300ZX
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easy enough to see a leak off a manifold, try placing cardboard under the engine area so the drippings will probably show. The black light system does work on small crack leaks like on a transmission case or a cracked engine block, good luck.
Jan 23, 2012 at 10:07 PM
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