My car has the 606 also and is two tanked. 800 miles is pretty low for a spin on. I would look a little closer at your filtering process and the weather. Cooler weather will thicken your blend and can cause the same stumble as a clogging filter. Also if you aren't sure your oil is dry, you may want to heat/settle a little more. I am not sure but I don't think the mercedes spin on is a water block filter, so it won't clog due to water.

Good luck with the car, I love mine.

__________________

Muleears
'07 E320 Bluetec 133K my DD
'04 Jaguar XJ8 VDP, 34K
'10 Hyundai Accent 60K Grocery Getter
'02 VW Golf soon to be on the road again
'97 E300 Diesel Son's DD
'61 VERY tolerant wife

Hampton Roads, VA USA

Gone but not forgotten:
'67 250S 95K
'86 300SDL
'87 300D Turbo, 364K! R.I.P.
'98 E300 Turbodiesel, 213K
'02 S420, 164K
'01 Prius 138K