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Old 08-06-2004, 07:09 AM
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Bull is partially right. It used to be that if you used PennZoil you needed to stick with Pennzoil, Quaker State, and a couple of other brands that came from that area. The same went with the oils from the Texas / West Coast area. If you stayed with those brands and changed oil on a regular basis you would not have sludge. The biggest factor was changing oil on a regular basis though. The majority of owners would put on twice or more miles than the recommended oil change. Then it was alway said that the Texas based oils were a petroleum base oil and the Pennsylvania oils were a parrafin based oil. The combining of these two oils was not completely compatable and would produce a thicker sludge like base. That combined with past due oil changes only added to the factor. PennZoil got a bad rap around here because it was so popular. People started sswitching to Texas based oils but would throw in some Penn because it was more convenient and on the shelf so when things happened..... But cars have changed drastically, the refinement of oils have changed drastically, and there are very few refineries although there are still a multitude of brands of oil. The largest factor is change oil every three thousand, change the filter at the same time, and your cars engine will last. For just a few bucks every three months you can't ask for better protection.
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