
06-02-2009, 06:46 PM
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Honorary Admin
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Join Date: Jun 2009
Location: Downingtown, PA
Posts: 3,742
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Re: Oil Pressure
It depends on the weight oil you have in it. Usually, straight 30 weight is run in the summer. Some guys go with the 10W-30...whatever you're used to. A heavier oil will lead to higher than normal readings. If you're running a light oil, then one or both of your oil relief plungers is sticking or you've got a restriction somewhere. Easy way to check that is to remove the plungers and run the engine again and see where the pressure is, then put one plunger at a time back in and check each time. Make sure the bores and the plungers are smooth and not binding (especially the spring) somewhere. The oil light should only come on at low (+- 5 psi) so I'm not sure why it's flickering at a high pressure. Sounds to me like the sender might be bad. But definately check the system, that amount of pressure at idle is too high. You'll wind up blowing seals somewhere, usually at the cooler. Which makes me think - have you got a remote oil filter by chance? If so, check the hose routing: if they are switched, it'll definately send the pressure soaring. Otherwise, if you have the standard VW sump filter, change that and take your oil cooler off and flush it out well (or find a new one). Sometimes they'll get clogged with crap, too, and drive the pressure up. Aren't engines fun?
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