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Buy New Engine Light - not a diagnostic
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Posted by Ari [Email] (#2847) [Profile/Gallery] (more from Ari) on Mon, 3 May 2004 12:59:46 Share Post by Email
In Reply to: oil sludge / oil pressure warning light?, Craig S, Sun, 2 May 2004 17:54:17
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The amount of time to get to the whopping 7-9 psi it takes to turn the oil pressure light off is a function of oil temp, engine turn-over speed (battery voltage, outside temp), and a host of other variables. I wouldn't put any stock in it.

The oil pressure light is really a "Buy New Engine" light. It's engineered when not to come on - it shouldn't come on with thin, hot oil on a hot day at idle. Typically 7 to 9 psi. Normal running pressure at 2K RPM or above with a warm engine is 20 psi or more. You might see 40 on a cold morning. If you're running 9 psi at highway speeds, the light will be out but the engine bearings will be toast in no time.

The best defense would be to de-sludge the engine. There was a nice writeup in this in NINES a few issues back (Shameless Plug). An oil pressure gauge would be very good.

I don't know if they still do it, but in the '80's VW had a nice, two-stage oil pressure warning. They had the 7 psi at idle switch, and another, 20 psi switch that was enabled above 2K RPM. Even better, the 20 psi "high speed" switch was wired to a buzzer. If that came on, you knew you should shut the engine down immediately.

Of course, VW got a batch of 20 psi switches with intermittent shorts in a certain temp range. So they'd occasionally give you the audio warning as the engine warmed up. Very nasty. But that's another story.


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