96 Bonneville Oil Pressure/Engine Knock problems - Page 6 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 04-02-2012, 10:12 PM   #51
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Harmonic balancer won't cause the oil pressure to drop. Unless you were revving 7000rpm and the balancer went unbalanced and fubard the crankshaft.
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Old 04-02-2012, 10:16 PM   #52
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There is something interesting....I turned on the car just now and the noise is gone. So obviously the noise only comes when the oil pressure decreases.(Which means the oil gets to thin)

I also revved it and I did not hear any knocking/ticking. So I revved it really heard to 4k and I heard the slight knock.

Maybe there is a slim hope it could be something else. (I doubt it though)
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Old 04-02-2012, 10:17 PM   #53
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Really wish there was a edit button on these forums.

Anyways, seems like replacing oil with thicker oil might actually work.
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Old 04-02-2012, 10:19 PM   #54
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Reason why I say replacing oil with a much thicker oil will help is because this will give the engine more time to stay at a stable oil pressure and engine knocking won't occur as fast.
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Old 04-02-2012, 10:20 PM   #55
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Just mind baffled that the knock and tick is totally gone.
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Old 04-02-2012, 10:22 PM   #56
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Let it run for a few minutes. Betcha it will come back.
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Old 04-02-2012, 10:24 PM   #57
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We'll I would assume so because the oil gets to thin as the engine gets hotter.
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Old 04-02-2012, 10:27 PM   #58
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The bearing clearances also increase due to thermal expansion. They are usually quiet when cold, but get louder as the heat increases.
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Old 04-02-2012, 10:28 PM   #59
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Just wondering how thick of oil I should go. 15-40 or 20-40 or 10-40
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Old 04-02-2012, 10:31 PM   #60
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I know alot of car dealers the sneaky ones will put straight 30 or 40 in vehicles to make them quiet.
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