they are supposedly using mineral oil (which is not good from what I hear).
I rather just use a good oil (no penzoil stuff). However if your car is old and you want to improve it its worth it.. but dont bother putting it in a new car.
I use it in mine, and I did notice that the engine ran a little smoother after it was put in. My local Nissan dealership sells it, and I had them do it.
mineral oil in your car hmm that seems wierd. but if a dealership does it maybe its not bad for you vehicle after all. Anyways I drive a newer escort and I was just thinking of ways to improve gas mileage.
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