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Originally Posted by ncof300d
OK....Here is my question. I have a 1985 300D. Per the oils listed in the owers manual I am having a hard time finding full synthetic oil of the weights listed. What full synthenic brand and weight do you use for a 617 engine? I use Mobile 1 0W40 and 5W40 for my 1999 E300. Would that be OK to use?
P.S. I live in Ohio near the Michigan border so I drive I a year round broad temperature range.
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Personally, I'm not comfortable using 0W40 in a 617. I believe the 0Wxx oils were developed for newer engines (some here will disagree). I like Mobile 1 5W40 for the 617, it seems to work well over a wide range of temperatures, including cold starting. It also seems to have more extensive diesel ratings (CI-4, CH-4, CG-4, CF-4 and CF) than the 0W40 (just CF). There are only two problems at the moment, price and availability. The 5W40 is in the process of being repackaged as "Turbo Diesel Truck" and hasn't been seen much for the last couple of months. Rumor has it that it will be available again soon. It also sells for about $5.50 to $5.99 in quarts or $20 and change in 5 quart jugs (if you can find it). The heavy truck version is Mobil Delvac 1 5W40, which costs about $28 for 4 quarts at your friendly truck stop. It is not clear (to me at least) if Mobil 1 5W40 is exactly the same stuff as Delvac 1 5W40, or not. Clear as mud?
Of course, you can use any diesel rated oil in the proper weight, conventional or synthetic. Any good 5W40, 10W40, or 15W40 should be OK. However, my experience is that conventional 15W40 gets pretty thick and cranks slowly on cold mornings.