----- Original Message -----
From: "Marshall Booth"
To: <[email protected]>
Sent: Thursday, April 24, 2003 3:41 PM
Subject: Re: [MB] Re: Mobil Delvac-1
> Four or 5 years ago I first brought up the question about Mobil 1 and
> Delvac 1 to a Mobil tribologist, he and his collegues agreed that they
> didn't believe there was ANY good reason to use Delvac 1 in an MB auto
> diesel. The properties that distinguish D-1 from M-1 are NOT things that
> will make any difference in light duty diesel service (and automobile
> and pickup trucks are LIGHT DUTY). That particular engineer had owned a
> 123 300TD and had used M-1 in it since new and it then had 225kmi on it
> (original timing chain still on it with less than 2 deg of chain
> stretch). He could have used ANYTHING he wanted in his car and selected
> M-1 over D-1. He put his money where his mouth was and it worked for
> him. Delvac 1 is a more sophistocated product - blended to meet needs
> that an MB diesel simply doesn't require - and isn't expected to need.
> So to the question about whether Delvac 1 is "better" oil, the answer is
> a resounding "YES it is." To the question about whether that matters,
> the answer is a somewhat less emphatic - "probably not!" I use it
> because the 5W40 viscosity seem ABSOLUTELY perfect for use in MY cars as
> a year round oil. When 0W40 becomes easily available and equavalently
> priced with M-1 15W50, I will probably use 0W40 since there seems to be
> NO need for D-1 in my cars. For now I have M-1 15W50 in one car and D-1
> 5W40 in 4. ALL run GREAT.
> Marshall Booth
> "der Dieseling Doktor"
> '87 300TD 168Kmi,'87 190D 2.5 210Kmi, '84 190D 2.2 226Kmi, '85 190D 2.0
> 156Kmi, '87 190D 2.5 turbo 217kmi
> Diesel Technical Advisor MBCA, member GWSection
-Scott>I do plan to use the Mobil-1 Synthetic ATF in the transmission, unless I can
>be convinced otherwise.
It's never been approved. Only Mercon/DexronIII
There is nothing that synthetic ATF will do for the transmission.
It cannot stop the clutch wear, which is really, the only thing that
wears out in the transmission.
A lot of folks think they are "upgrading" when they really aren't doing
anything but a bit of psychology. They think they are doing something
better, when in fact, there isn't anything better to be done.
While the drive to improve is usually admirable, in this case it doesn't
My best recommendation is to stay with an M-B approved oil. Viscosity by itself tells only a small part of the story. Have you taken some time to study Wolfgang's page which lists the MB approved oils?I have also heard that the additives, ratings, and MB specs apply only to new cars, not to the 20+ year-old ones I have. ( I have a 1980 300SD, a 1981 D, a 1982 300 SD, and a 1982 D Turbo.) Also, knowledgeable people tell me that the additives only are necessary for high sulfur fuels that are no longer sold here.