I probably would be shouted at for writing this. I think people are paranoid. I mix it all the time, w10-30, w5-40 etc to my gas cars and diesel cars and it never gives me problem. If the car is a precision instrument like a watch then I probably would not do it. But MBZ engine is built tough and can take abuse within reasons. It may shorten the engine life by 1k miles out of 500K, I would still be very happy with 499K.

One thing I never short changed myself is the interval. I always change the oil between 3k-4k miles.

__________________
Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

1 X 2006 CDI
1 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.

Just a warning: Richard Pryor did it and he caught on fire!

__________________
99 ML320
94 SL600
92 SL500
95 E320 Cabriolet
87 560SEC
86 300SDL Grease Car
80 380SLC Euro

13 Fiat Abarth
02 Maserati Spyder Cambiocorsa
00 BMW Z3
90 Rolls Royce Silver Spur
80 Ferrari 308 GTSI
88 Jaguar XJS12 H&E Edition
99 Land Rover Discovery

Yeah, that's what I was thinking. The car will probably never know the difference. It's only 1/2 quart out of 7 quarts, that's 1/14 of the total. Not going to ruin the entire engine for a few thousand miles of oil.

Thanks,

jeff