me again what the best oil for the engine

[preston]

300SD 5cyl i am running moibe1 20w50 for diesel but i feel it way to thick the speed doe stop at 189,000 when i bought it so miles on engine are ???? but who ever own it before my kept up on it it looks like it was a sales mens car all highway miles it came with all the records in the owners manual it show to use regulor motor oil but i work on heavy Equ we used high detergent diesel oil 20 w 40

What's the best oil..........Hmmmm, I use Moble-One W15-50, as do many others here and change at 5K miles. Oil analysis done by a member here ( he has the same 603 I have) concluded that soot levels in the oil, after 5K miles, start to become abrasive, thus decreasing lubricating quality.

Other members will argue that synthetic oils are really no better than standard diesel rated oils, and that may be true to a point, 3K mile change, but synthetic oils may allow another 2K miles before oil change. ....BB

[Hatterasguy]

Their is no such thing as Mobil 1 20w-50. But their is 15w-50 that is what I will assume you are talking about. I have run mine year round on it without any problems and my engine has way more miles then yours.

[pastmaster]

Preston;

Since in you're involved with HD diesels, I think a 15w40 HDEO, is ideal. These are the best oils for diesels. If you want to spend more money and use a synthetic oil, consider Mobil Delvac 1 5w40, Shell Rotella T Synthetic 5w40, etc. These HDEO's, have Soot Control additives, the PCMO's, (car oils), don't have, and the anti-wear capacities that the newer car oils lack.

Change the oil and filter in a timely fashion for the way you drive, at least to Mercedes-Benz specs, or better. Drive Safely...Paul

[preston]

Thank all for ya input this is my first german car i traded a 1982 honda 450 with 1800miles on even thow th speed do works the miles odmeter dont work which i have seem to see afew other the gears seem to fall apart so like i say i dont know the real miles orf it it stop at 189.000 so i dont really know how meany on the car but i meet one guy he had 600,000 on his with the same engine and tran he side oil changes and tune ups THANK FOR ALL YOUR HELP I HOME TO FEEL REAL AT HOME HERE

[aklim]

Delvac 1 & Mobil 1 Truck and SUV are the same. Both are CI-4 rated

[whunter]

It's alive, another oil thread.
Seriously; search the topic, there are too many threads to read in a month.