Date registered: Feb 2010
Vehicle: 1972 280SEL daily driver. 904 Dark Blue with cognac interior. euro 4.5 engine
Location: Williamsburg, VA
Mentioned: 3 Post(s)
Quoted: 34 Post(s)
I use Castrol. I use 20W50 in summer and will likely use 10W50 in winter.
Per the mercedes manual for the 117 engine, here is the official MB guideline:
If ambient temps are consistently below 14F, use 5W20 or 5W30.
If ambient temps are between -4F and 50F, use 10W30
If ambient temps are consistently above freezing, use 20W40, 20W50 or straight 30W
If ambient temps are consistently above 5F, use 15W40 or 15W50
If temps are consistently above -4F, use 10W40 or 10W50.
If temps are consistently aboe 86F, use straight 40W
That said, I had been using high mileage Castrol in my 350,000 mile m117, but now that I have a "new" one, I am using regular Castrol.