Oil Problem??
05-15-2008, 07:48 PM
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Oil Problem?? I run royal purple and I took My car to a shop to have the headers installed. They added quaker state conventional. Is there going to be any problems with those 2 oils mixing???? Help please.
05-16-2008, 09:13 AM
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No. Synthetic mixes fine with conventional as does oils of various weights; you just end up with an average of their properties. Though you've lost (or reduced) the longer change interval benefits of the synthetic. Change in 3-5k miles or whenever the RP was due for a change, whichever comes first.
