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Pontiac Forum: 2004 Pontiac Grand Prix GT oil?
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Old March 5th, 2009, 09:42 PM
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2004 Pontiac Grand Prix GT oil?

We took my girlfriends 2004 Pontiac Grand Prix GT in to get its oil changed. What kind of oil did the car come off the lot with from that year? Was it fully synthetic or was it dino oil? I'm a bit concerned, because the shop put in regular dino oil and since we bought the car used we have no idea what kind of oil was put in there during previous oil changes. Will there be any harm done from switching from synthetic to regular if that is indeed what happened? Or vice versa?

Her car as 67000 miles on it, if that helps.
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Old March 5th, 2009, 09:42 PM
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probably just used regular oil

and doesnt hurt if going from synthetic to regular

but i heard some bad things about going from regular to sythnetic
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Old March 19th, 2009, 11:14 AM
99Green GTP 99Green GTP is offline
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it's actually kind of vice versa...It is probably fine, the csarmost likely had regular oil in it to begin with. However, switching from regular to synthetic is fine, its switching back tat is a bad thing to do. see, synthetic oil is much more tolerant to hard driving, cold starts etc. It adheres itself to internal engine componenents and stays effective at higher temperatures, helping to reduce engine wear. However, due to the natue of how it works, it does not clean out the crankcase like regular oil. If you change back to regular oil, it will break up the sythetic oil that has adhered to the inside of the crankcase, and that can gum things up badly when you have chunks floating around in there. You should be fine though, not many people really run synthetic oil anyways.
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