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Originally Posted by larrybroga
Another thing most people don't realize is that the oil from drums, which the instant lube places use, has a different paraffin base than bottled oil and after a period of time will cause a buildup in the engine. Most of the technicians that work in these type places are not aware of viscosity issues with the oil they sell. Numerous engine failures that we experienced at the sheriff's office were because of this buildup. If you don't change your own oil, ask whoever does to use bottled oil. They will give you a hard time about it, but just insist. It will pay off if you are keeping your car for a long time or drive it hard.
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Bulk oil (in drums) can even be recycled oil
I used to work at the "other" chain store in Tallahassee I can tell you some Horror stories..... but i won't on a public forum...... trust me..... STAY AWAY!!! for about the same $$$ or less have the dealer do it!!