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Old 12-30-1999, 11:03 PM
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Aaron Aaron is offline
Join Date: Aug 1999
Location: Cincinnati, Ohio
Posts: 1,935


As VA300SD said, you do have to give the car a good hard run every so often to keep things cleaned out (i.e. carbon). I give my 300SD an "Italian tune-up" just about each time I get on the freeway with it, and when I travel back to Cleveland on the weekends from Cincinnati (about 250 miles), I will try to keep it at a constant 4,000rpm traffic permitting, that is. It doesn't hurt to use a bottle of Red Line Diesel Catalyst every now and then as well. I use Castrol GTX 10W-40 in all of my MBs, but tried Castrol RX Super 15W-40 in my 300SD on the last oil change. It is formulated for diesels and does meet Mercedes-Benz engine oil standards, but during this cold weather I think I am going to go back to GTX 10W-40. In addition, I notice that the car runs cooler with 10-40 in it versus the 15-40 on those hard highway blasts. Hope this helps!

Aaron Greenberg
MB technician
Precision Motorcars, Cincinnati, Ohio
'67 250SE Cabriolet
'77 450SL
'79 6.9
'80 300SD
'85 380SE
'89 420SEL
'93 300E 2.8

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