Thats why i dont really believe in the 25k, 1 year change unless your engine is in good condition, because as you said, there are many factors that effect how long the oil can be in the crankcase. I sell alot of signature series but those guys use it in their show cars, i have a couple commercial accounts using it as well. I have regular joes who use it but their motors are in good shape. Otherwise i just recommend the OE or XL, decent change interval, maximum protection, and savings as well.

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Do your car and move up to Amsoil.