I know Mobil1 makes the 5W50 but it has to be special ordered and its not cheap. I spent around $108 for a 2 cases of 6q for the pennzoil. The Mobil1 is a bit more, and also we are all familier with Mobil1's good quality so Im just testing the waters for us. Plus I have been doing some reading and it seems that this pennzoil runs pretty clean.
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