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have a compression test done on the cylinders...sounds like the rings are bad allowing oil to blow into the cylinder...you may be able to fix it by adding a can of seafoam to your oil and see if that fixes it within a couple of weeks. You can buy that at any auto parts store or walmart or kmart.
I would check the idle air control valve before replacing anything. The computer regulates the idle speed by controlling the amount of air entering the intake thru the throttle body. The valve could be faulty, or the throttle body can be gummed up. Is the check engine light on ?
Well, lets see....there is no "Grand Prix Turbo" so I am assuming that you mean that your Grand Prix is a 3.8L that is equipped with a supercharger.
The supercharger bearings are lubricated with synthetic oil that is contained in the supercharger gousing. It is self-contained and does not rely on engine oil for lubrication. You can check the oil level in the supercharger by removing the plug in the supercharger housing (see diagram)
There is seal kits.available for the.m 90 supercharger on the 3800 go to zzperformance.com youl find an eye.full off aftermarket and hard to find parts for the gtp.
Take it to a ac specialist.. The will put in some coolant and also put in a die.. They will chaeck it again in a few days with a floresant light that wil pick up were the die is coming out.. Could be a leak at a hose..
It could be the Oil pressure sensor is bad and leaking oil, There know to go bad and will leak worst when driving as the oil pressure goes up.
Good luck and hope this helps.
Nowdays 1 Qt. in 3000 miles, really isn't that bad, even some new vehicles claim that's normal. I know with my current vehicles, both at approx. 150,000-160,000 miles, they won't use any for first while after an oil change, but then after mileage starts adding up again, they start to use a little, approx.I Qt, every 1000 miles or so, until it's changed again. I've switched to the high mileage oil, just for piece of mind, as they say it revives seals, and has added protection for the higher mileage engines.This time around I'm thinking of adding "Lucas" & see how it works, as I've heard some pretty good reports on it, just to see if it will prolong that oil breakdown, at mid change.
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