1991 Toyota Cressida low oil pressure

Tiny
DRFT911
  • MEMBER
  • 1991 TOYOTA CRESSIDA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 223,000 MILES
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)
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Monday, August 9th, 2010 AT 3:11 AM

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Tiny
MHPAUTOS
  • EXPERT
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)
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Monday, August 9th, 2010 AT 5:49 AM

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