I just switched a 380SL to Shell Rotella, the 420SEL gets Chevron Delo. I haven't seen problems, but both my parents say the Delo 15-40 makes both cars run smoother compared to Castrol 20-50. As for the lawnmower oil debate, my mower powered by a Honda GCV160 engine calls for 10W-30, there's a sticker that says "Genuine HONDA 10W-30 oil is recommended".
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1984 380SL-driving and service privileges.
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