I personally would use 10W 40 or 10w 50, but I think you will be fine if you still want to use 10w 50. I use 20w 30 dino CASTROL, but when I switch to synthetic, I will keep the higher weight because I need supreme cooling! I drive hard. Good luck with the decision!

[Edited by David C Klasse on 05-09-2001 at 08:05 PM]

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2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)