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Low Oil Pressure: Common in Older birds?

This is a discussion on Low Oil Pressure: Common in Older birds? within the Firebird / WS6 forums, part of the Vehicle Specific category; I've been in the look for a Trans Am. I have looked at 2 T/A's within the last 4 days, ...

  1. #1
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    1975 Chevy C10

    Low Oil Pressure: Common in Older birds?

    I've been in the look for a Trans Am. I have looked at 2 T/A's within the last 4 days, and both (1997-98) had very low (20-0) oil pressure. Both these T/A's had 100,000 miles or less. I know low oil pressure is not good....at all, but when one of these T/A's hit 0 oil pressure on a test drive, and the "check gauges" light came on, this tripped me good.

    Whats normal oil pressure on a warmed up good compression lt-1, or ls-1?

  2. #2
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    2000 Camaro SS

    At warm idle, 15 psi to 40 psi. Cold start should have 40+ psi. A good rule of thumb is 10 psi per 1000 rpm while driving.

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    1975 Chevy C10

    Thank you for the info.

    These cars were seriously put through some hard times with "0" idle oil pressure.

  4. #4
    War Machine BIG GUNS's Avatar
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    00 Trans Am/Auto

    Yeah, 40-50psi is what mine runs.

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    Senior Member Too Fast's Avatar
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    2000 WS6 6spd Hooker LT

    LT1 cars were up to 1997, '98 and later are LS1. I friend of mine bought a '96 TA convertible this spring, before he bought it from his father in law we took it for a drive and I noticed the oil psi was very low, 15-20 at warm idle. He talked to the inlaw, he said it has always been that way when warmed up. So, maybe it is not a concern. The car has 100k on it. My '00 WS6 has 70k now, warm idle pressure still over 35.

  6. #6
    Impounded
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    79 T/A -91 Firebird
    1998 Trans Am -Oynx Black

    7 psi at hot idle is what GM says is the minumum amount that should be allowed in a ls1.. cant remember where my dad showed me but that isnt comfortable to me. He said people used to come in to the shop all the time with OP less than 30 and be freaked out and then he would show them that...believe it or not.

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