the 44k should clean out most of the carbon in your system. I believe the trick is to add it, then drive the car hard to get it to spit out all that carbon..

The oil, might be a little thick.

I use 20/50 as well, and my car makes a ticking on cold startup for a few seconds until the oil pressure builds up.

A Thinner viscosity oil might help it circulate more for you.

I would definately do some searchign on this site, you might find your question has already been answered.

Alon

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'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon