Thread: Anyone Running Mobil 1 0W40 in HOT climate?
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Old 02-26-2007, 08:36 AM
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Location: Luckenbach, Texas
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I run Mobil 1 0w40 in my SLK320. I run 20w50 in my 450SL. The older engines are engineered to use the thicker oil...larger oil passages and all that.

I used both 15w40 and 20w50 in the 450SL, and the difference in oil pressure waiting at a stoplight is noticeable. Especially on a hot summer day!
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'01 SLK320, '79 450SL & '01 C320 -- What? 3 Mercedes? I am DEFINITELY crazy!!!
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