Quote:
Originally Posted by page62
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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I have always liked higher viscoscity oils for the better heat tolerance properties, especially in older engines. After buying the 450SL an oil change was mandatory. I used 10W40 Pennzoil for the winter. The oil seems to be performing as advertised, no problems noticed. With a Texas summer looming the change to a more heat tolerant oil would probably be wise. 20W50 is looking good.