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Aug 29, 2005 | 12:21 AM

#46

dybeepvw

Mountain Pass

Joined: Sep 2004

Posts: 249

Likes: 2

From: AZ

Stay with the CF rating on the oil and forget that SM stuff, the CF,CM rated oil is all the protection you will ever need, it comes in all weights, dino and synthetic, I think the new Mobil even has the CF rating. There's my 2 cents worth.

Aug 29, 2005 | 12:25 AM

#47

ford390gashog

Fleet Owner

Joined: Jan 2004

Posts: 26,007

Likes: 575

From: Brentwood,CA

what?why would you do that? that oil is very very old and no longer made.

Aug 29, 2005 | 12:26 AM

#48

ford390gashog

Fleet Owner

Joined: Jan 2004

Posts: 26,007

Likes: 575

From: Brentwood,CA

the newest is CI-4+

Aug 29, 2005 | 06:56 PM

#49

Flash

Posting Guru

Joined: Jul 2001

Posts: 1,914

Likes: 1

ford390gashog, Try to remember that the original 5w-20 speced oils were 153-H. Then came the 929 speced oils which are the 5w-30 oils. Then came the new specs for the 5w-20's which is the 930 spec. I know it appears backward but that's how it came around. The lighter oil has the bigger spec number.

Aug 29, 2005 | 08:04 PM

#50

optikal illushun

Postmaster

Joined: Mar 2002

Posts: 3,545

Likes: 4

From: Coal Region

oh, makes sense now

Aug 30, 2005 | 12:52 AM

#51

ford390gashog

Fleet Owner

Joined: Jan 2004

Posts: 26,007

Likes: 575

From: Brentwood,CA

Quote:

Originally Posted by Flash

thanks flash for clearing it up.

Sep 2, 2005 | 11:14 PM

#52

81-F-150-Explorer

Post Fiend

Joined: Jul 2004

Posts: 8,786

Likes: 28

From: Northern California

Thanks guys for the info on the Newer SM oil.

I have enough 10W-40 motorcraft SL for one more oil change, and I'll be switching to 15W-40 Motorcraft Diesel Motor Oil. It's the same price, and I can still buy it in bulk as well.

It will be a little thicker at startup, but a small price to pay, if it keeps your engine safe.

Thanks again.

Sep 14, 2005 | 08:15 PM

#53

mcne

Senior User

Joined: Mar 2003

Posts: 105

Likes: 0

Trying to revive this post. Does anyone use Mobil 1 synthetic for their 300? I saw a special truck formula for both gas and diesel which was 15w40 I think. It doesn't say 15w40 on the front of the bottle like regular oil does. It says "truck formula" or something like that. Anything I should know about this Mobil formula?