Mobil done it again - changed Delvac-1 and Mobil-1 formulas - Page 5 - PeachParts Mercedes-Benz Forum

Hatterasguy · #61 05-25-2008, 10:44 AM

Quote:

Originally Posted by Cr from Texas

The dealer's plan is to also sell you all the scheduled services that are due when you come in for an oil change, maybe an extra that's not needed but suggested. They will cover the oil change cost with the other services. Probably a break even deal for the customer but a good selling point for the dealer.

Charles

Yeah and most people probably go for it, but were not. A 30k mile service on that car is like an air filter. New cars really don't need much.

Hatterasguy · #62 05-25-2008, 10:45 AM

Quote:

Originally Posted by Cervan

could this simply be because of the efficient 4v per cylinder design of the 603? With more oxygen to burn there is less unburnt diesel (black smoke) That may be a large cause of it. Also inline six cylinders are naturally balanced as well, Not sure how that matters, but it helps them rev more freely.

602/3 has a 2 valve head.

The 606 has the two cams and 4 valves per cylinder.

Bio300TDTdriver · #63 05-25-2008, 10:45 AM

Quote:

Originally Posted by Cervan

could this simply be because of the efficient 4v per cylinder design of the 603? With more oxygen to burn there is less unburnt diesel (black smoke) That may be a large cause of it. Also inline six cylinders are naturally balanced as well, Not sure how that matters, but it helps them rev more freely.

The 603 only has 2 valves per cylinder. The 606 has 4. I think the 603 at least the ones I've seen have less blow by then all the smoking 617 videos I've seen posted here. I have no idea if that makes a difference.

gsxr · #64 05-25-2008, 12:08 PM

I get my oil analysis from Mobil Accutrack. The "extended drain" kit also tests for TBN and F-Soot. The kits are something like $18 each and include postage to send the sample in. I attached a small blurry scan of the report, since the forum won't allow anything larger than 800x600 or 70kb.

The first three on there (tested in '04, '05, and '06) are all Delvac-1 (or M-1 TDT) 5W-40. The most recent (tested in '07) was a mix of D-1 5W-40, and some 15W-50 EP, which probably explains the low TBN. I just sent in my '08 sample (all 15W-50 EP) and should have that back in a week or two, I'll try to remember to post it when I get it. I'm switching back to Delvac-1 5W-40 now so it should be interesting to see the comparison with the 15W-50 EP.

Rob124 · #65 05-26-2008, 12:29 AM

Since wally world now seems not to carry my usual M1 5W-40, I wondered if Rotella Synthetic might be a good alternative. The comments in this thread seem negative, but I found this, evidently originally derived from a rotella.com forum, but previously posted here in the Tech Help discussion:

"It is true that ROTELLA T Synthetic is Group III (not PAO) based, but you must keep in mind that not all Group III base oils are created equal. ROTELLA T Synthetic is made with Shell's XHVI base oil, which unlike other Group IIIs does not begin as distilled crude oil, hence of all Group III base oils, XHVI is truly the only one that can legitimately be called "synthetic." XHVI is a wax isomerate, meaning that it is made from the slack wax removed from distilled crude in normal solvent dewaxing. This slack wax is catalytically transformed (isomerized) and hydrofinished into a chemically pure base oil which rivals PAO in virtually every category. There are other "synthetic" oils out there based on Group III, but Shell's is unique in that it uses XHVI base oil. Chevron and Petro-Canada produce Group III base oils that come close to XHVI, but even though these oils are all hydroprocessed and utilize the same type of isomerization technology employed in the making of XHVI, they are not the same thing. Only XHVI is made from pure petroleum slack wax and its CAS number is 92026-09-4. The CAS number for the more typical all-hydroprocessed Group III base oils is 64742-54-7. If you want to know what your "synthetic" oil is made from, take a look at the MSDS and look for these numbers. (The CAS number for PAO is 68037-01-4)."

So, might it be true that not all Group III oils are created equal?

vstech · #66 05-26-2008, 12:53 AM

yeah, the only place I have seen 5W40 M1 is o'reilly auto parts, and they wanted 6.50/quart... SOoooo glad I still have some that I got for 4.00 a quart... Cleaned out a for sale cart at Advanced.

Hatterasguy · #67 05-26-2008, 01:31 AM

So whats the verdict on these? I have an oil change coming up in the not to distant future and am wondering if I should get the ESP stuff from the dealer or Amsoil 5w40 diesel oil.

Amsoil costs slightly more, but I don't really care since I do like 2 maybe 3 oil changes a year on this car. Probably 2 this year since I'm driving less.