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+--- Thread: What oil? (/showthread.php?tid=590)
What oil? - ForcedInduction - 08-09-2009
Yes yes yes, I know, OIL THREAD!!!!!11!!!1!
I'm having a hard time choosing between these two for the 300D.
http://www.mobil.com/USA-English/Lubes/PDS/GLXXENPVLMOMobil1_Turbo_Diesel_Truck_5W-40.asp
http://www.mobil.com/USA-English/Lubes/PDS/NAUSENPVLMOMobil1_15W-50.asp
Both are real full synthetic, both are Diesel rated. The 300 has no form of heater and, unless the 240 dies, it will be a warm weather car.
15w-50 has higher phosphorus and zinc levels for extra anti-wear, thicker lubricating surface, higher hot oil pressure and 5qts for $22 (vs 4qts).
5W-40 is specifically for Diesels, meets many more diesel oil API specs and handles soot better. The big downer is that its made with low phosphorus to not foul the EPA's precious DPF.
Right now I'm strongly leaning towards the 15W50 for the extra anti-wear additives unless somebody can come up with a really compelling reason to go for the 5w-40....
RE: What oil? - JB3 - 08-09-2009
Winter cold starts would be my vote for the 5W-40. Im a convert after watching the difference last winter.
RE: What oil? - willbhere4u - 08-09-2009
The phosphorous and zinc are good for the high pressure lubricant for the cam shaft/followers if you don't have roller lifters! witch Benz diesels don't back then I would run the 15/40 until you have a problem with cold weather then change it!
RE: What oil? - ForcedInduction - 08-09-2009
The 300 won't see cold weather. When it starts to get cold outside I'll switch to the 240 with its toasty heater and manual climate controls.
RE: What oil? - JB3 - 08-09-2009
well heck, that makes this decision easy! go for the 15W-50. It will be interesting to see how it affects the car.