96 Bonneville Oil Pressure/Engine Knock problems - Page 7 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 04-02-2012, 10:49 PM   #61
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Putting a different type of oil in it is NOT going to fix it. It'* not going to prolong the inevitable either.
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Old 04-02-2012, 10:52 PM   #62
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Don't want it fixed, Just want the knock to go away for a little while longer.
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Old 04-02-2012, 11:18 PM   #63
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I'll be replacing with 20W50 oil tomorrow. I'll let you guys know how it goes.
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Old 04-03-2012, 03:06 PM   #64
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I got some good news, person sold it to me willing to help up to $500 on another used car.
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Old 04-03-2012, 03:11 PM   #65
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Just some pictures of the metal build up on the oil plug I took today.
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Old 04-03-2012, 03:26 PM   #66
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That thing is toasted. I'd love to see whats in the bottom of the oil pan. Might as well pull it and clean out whatever metal crap inside of it. Otherwise, oil change would do nothing.
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Old 04-03-2012, 03:47 PM   #67
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Yeah, I know its to late but the oil pressure is now steady at 30 PSI hot idle (200+temp) with 20w50. Before it was 10-15 PSI at hot idle.

So I guess for those who have a 3800 and are concerned with low oil pressure (under 25PSI at hot idle) change oil to 20w50 and it will increase your oil pressure before it is to late.
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Old 04-03-2012, 04:00 PM   #68
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What don't you understand about it already being too late? Telling people to change to a different weight is not going to help and only confuse them.

Under normal circumstances, when the oil gets old and hot, it will lose the ability to maintain pressure. I have verified this many times. Yes oil pressure will fall down to about 30 psi. Once the oil is changed with normal weight(5W-30) or (10W-30), oil pressure will return back to roughly 50 psi cold, and about 40 hot. Once about 3 months goes by, you will notice a high cold pressure, then a low warm pressure. This is completely normal. In your case, the filter is clogging up with metal shavings STARVING the engine of oil.
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Old 04-03-2012, 04:35 PM   #69
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Won't do no harm for people living in a hot climate to increase oil weight if there Oil PSI is below normal on hot idle.
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Old 04-03-2012, 11:12 PM   #70
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Sold Car, good riddance. Thanks for the help everyone on this Forum.


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