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Originally Posted by afmcorp
but i know i'm on the outside when it comes to oil choice here on the forum. all my cars get dino 20w50w high mileage castrol. year round and oil change at 2500 miles. but i use regular unleaded gas as well so now that i've confessed and committed sacrilege to the MBZ brand please don't boot me off the forum. i do however use premium when it gets really cold say about zero.
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Craig - Lots of us older folks have used Castrol 20W-50 for years and that's why we have cars that are as old as they are. As one knowledgeable member here reported sometime back(JackD), synthetic pays a higher margin to the oil companies. The so-called "extended" changed interval has turned out to be a lot of hooey. I've taken too many cars past 300K using dino.
It's been reported more than once here that the 103 motors run better on mid-grade which is just overpriced lower grade.