1991 Toyota Cressida low oil pressure

1991 TOYOTA CRESSIDA
223,000 MILES • 6 CYL • 2WD • AUTOMATIC
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DRFT911
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The cars oil pressure light would stay on after warmed up enough and at an idle,changed the oil to 15-40w and added lucas oil stabilizer, then tested the oil pressure with gauge and warmed it up, first started it went from 40psi @ idle and slightly creeping to 18psi and would rev to 3k 70psi then 65ish. Is it pump or bearings? after oil change light doesnt stay on (light on 5-7psi)
Aug 9, 2010 at 3:11 AM
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MHPAUTOS
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HI there,

I would be thinking that the pump performance is fairly good considering the miles on the engine, i would be more inc lined to be suspecting excessive bearing clearances as the oil thins out the pressure decreases but at revs the pump can compensate to some degree, i would be looking at using a 20W-50 mineral oil as this may help with the pressure.


mark (mhpautos)
Aug 9, 2010 at 5:49 AM