Oil leak

1992 BUICK ROADMASTER
163,000 MILES • 5.7L • V8 • 2WD • AUTOMATIC
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77LEBARON
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I was flushing out my coolant system after many water flushes I revved the engine up to 3,000 RPM's and when I looked under the car there was a sizable puddle of oil. It appears to be coming from the top from the drivers along where the engine and transmission mate. I am hoping it is a loose hose but I fear it could be a gasket.
Mar 31, 2019 at 11:07 AM
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ASEMASTER6371
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Good evening,

From that area, it could be either the intake manifold or the valve cover gasket.

The oil pressure switch is also back there as well.

Get a bright LED light and look over the back of the top of the motor for the leak.

Roy
Mar 31, 2019 at 11:45 AM
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77LEBARON
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Would the oil pressure switch or intake manifold or valve cover produce such a large amount of oil in that b10 second period?
Mar 31, 2019 at 11:50 AM
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ASEMASTER6371
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For a ten second period, I would think the pressure switch.

Roy
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Mar 31, 2019 at 12:00 PM
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77LEBARON
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And would continuously leak also? my oil pressure has been different also since the leak. I will take the bright lights to that area tomorrow and notify you of my findings . Thank you
Mar 31, 2019 at 12:51 PM
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ASEMASTER6371
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You are welcome.

Always glad to help.

Roy
Mar 31, 2019 at 12:54 PM
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77LEBARON
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Well I do believe from my amateur inspection that the primary leak is the oil pressure switch. I have the shop manual and supplemental coming in also. Another seepage leak is coming from the front of the intake manifold someone did a horrible gasket job on it . Thanks Roy for the input and if and when other questions arise I will be back here.
Apr 6, 2019 at 7:44 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
You're welcome.

Always glad to help.

Roy
Apr 6, 2019 at 8:02 AM
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