TheEnder53
Member
- Joined
- Jan 13, 2024
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So the engine in my Tahoe is a 01 LM7.
When i bought it, oil pressure was around 35-37psi warmed up. Then it was around 50-55 cold.
Oil presssure then began to drop when it was hot over the course of about 2 weeks. Lowest it got was 26psi hot.
Replaced the oil with 5W-30, oil pressure went back to how it was before.
There were also some metal spirals in the oil with some very small metal chunks. I am equating this mainly to the fact the drain bolt was severely stripped and the past owner replaced it with a 28mm aftermarket stripped oil pan bolt.
Engine runs absolutely flawlessly aside from what i think is some lifter tap/piston slap at a cold idle. It is so silent you can easily miss it though.
What happened for oil pressure to drop?
When i bought it, oil pressure was around 35-37psi warmed up. Then it was around 50-55 cold.
Oil presssure then began to drop when it was hot over the course of about 2 weeks. Lowest it got was 26psi hot.
Replaced the oil with 5W-30, oil pressure went back to how it was before.
There were also some metal spirals in the oil with some very small metal chunks. I am equating this mainly to the fact the drain bolt was severely stripped and the past owner replaced it with a 28mm aftermarket stripped oil pan bolt.
Engine runs absolutely flawlessly aside from what i think is some lifter tap/piston slap at a cold idle. It is so silent you can easily miss it though.
What happened for oil pressure to drop?