I am not obsessed with oil. Walmart "supertech" oil is good enough for me.
Change it often.

None of my car has problem with Supertech. Go figure. In fact, they are all pretty happy with it. I do complain to walmart about the price hike thse days, though.

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11 S550
09 C300
91 560SEL
90 300CE
84 380SE
83 240D