Changing my oil - but (GASP) not with Mobil 1 - 0W40

[GoofyTimL]

I used to use Mobil1 in out C's until I switched to Quantum Blue synthetic oils last fall. They blend 5W20 for the Heritage Edition, and a specialty 12.5W40 for our SRT8 engines.

[JMatt]

Originally Posted by sjz

My old IHC Scout engine uses flat tappets, and I became aware of the deficiencies of the newer standards via the Scout forum which I frequent. After rebuilding that engine, I was warned that many folks were wiping their cam lobes because the new oils did not contain enough zinc and phosphorus to provide proper tappet lubrication during the cams break-in period... a very critical time. (Most modern (newer) engines use roller valve tappets, which are not too much of a problem for the cam.) GM's E.O.S supplement was mentioned as a fix. My IH engine does not have a cat, so no worries there. I used it, all was well. Maybe I'll add a drop of E.O.S to my SRT until my supply of Mobil1 0W-40 is gone.
Here is an interesting article which ties in with what you mention about the Porsche engines:
Oils: What oil should I use? Which oil is best for my Porsche or aircooled engine?
-Steve

LOL - would it surprise you to know that a printout of the website you linked is on the passenger seat of my SRT-8?!? Check out the Zinc and phosphorous levels in the Delvar 1, compared to what USED to be available. Then compare it with the current 0W40.

[srt8danno]

So am I understanding this correctly? They changed the formula of the 0W40 so it isn’t as good as it once was? Not to be a dunce, but I’ve read so many oil threads in my days it all becomes mush to my brain. Or maybe it just turns my brain to mush.

[JMatt]

Originally Posted by srt8danno

So am I understanding this correctly? They changed the formula of the 0W40 so it isn’t as good as it once was? Not to be a dunce, but I’ve read so many oil threads in my days it all becomes mush to my brain. Or maybe it just turns my brain to mush.

The current 0W40 in our cars from the factory is PROBABLY the SM version. The SM classification came out November 2004. The first 2005 SRT-8's (not counting pilots) were built in February 2005.

0W40 had low levels of Zinc and Phosphorous to start with, even under the SL classification. They appear to have gone down another 10-15% under the SM classification.

Again - just like running a 200 thermostat instead of 180, or reformulating carnuaba waxes based on VOC content, or changing from freon to whatever we use now, the changes are for emissions purposes.

Even Mobil 1's own answer seems to imply that 5W40 turbo diesel oil is a pretty good choice for performance cars.......

[srt8danno]

Originally Posted by JMatt

The current 0W40 in our cars from the factory is PROBABLY the SM version. The SM classification came out November 2004. The first 2005 SRT-8's (not counting pilots) were built in February 2005.

0W40 had low levels of Zinc and Phosphorous to start with, even under the SL classification. They appear to have gone down another 10-15% under the SM classification.

Again - just like running a 200 thermostat instead of 180, or reformulating carnuaba waxes based on VOC content, or changing from freon to whatever we use now, the changes are for emissions purposes.

Even Mobil 1's own answer seems to imply that 5W40 turbo diesel oil is a pretty good choice for performance cars.......

Gottcha! Thanks for the explanation. Is that oil as hard to find as the 0W40 is?

[GEN XER]

Originally Posted by GoofyTimL

I used to use Mobil1 in out C's until I switched to Quantum Blue synthetic oils last fall. They blend 5W20 for the Heritage Edition, and a specialty 12.5W40 for our SRT8 engines.

Quite interesting Tim. Is the price $10 per qt?

[JMatt]

Originally Posted by srt8danno

Gottcha! Thanks for the explanation. Is that oil as hard to find as the 0W40 is?

Local O'Reilly Parts store had 18 quarts on hand. I took 11 for the 911 and 7 for the SRT-8. Cleaned 'em out. I believe it's pretty widely and easily available.

[GoofyTimL]

Originally Posted by GEN XER

Quite interesting Tim. Is the price $10 per qt?

$9.95 when purchased in multi-quart quantities. I just received the next gal and a half for the Heritage (have 2 quarts from previous). And this change will be 7500 miles. After a confirming oil analysis, the next step will be 10k miles.

I'll go 5k miles immediately on the first change to QB on the MSRT8, and after another analysis it will go 7500... or possible 10k. So, vs. changing Mobil1 at every 3k... it evens out. And I do believe the technology in this oil is legit.

[GEN XER]

Originally Posted by GoofyTimL

$9.95 when purchased in multi-quart quantities. I just received the next gal and a half for the Heritage (have 2 quarts from previous). And this change will be 7500 miles. After a confirming oil analysis, the next step will be 10k miles.

I'll go 5k miles immediately on the first change to QB on the MSRT8, and after another analysis it will go 7500... or possible 10k. So, vs. changing Mobil1 at every 3k... it evens out. And I do believe the technology in this oil is legit.

Im going to have to research this oil I see. I have 7qts of moblie one and the filter which Im changing in 500 miles after that I should have all the info I need to either make a switch to BD, Amsoil or Royal Purple.

[Moose]

Originally Posted by JMatt

The current 0W40 in our cars from the factory is PROBABLY the SM version. The SM classification came out November 2004. The first 2005 SRT-8's (not counting pilots) were built in February 2005.

0W40 had low levels of Zinc and Phosphorous to start with, even under the SL classification. They appear to have gone down another 10-15% under the SM classification.

Again - just like running a 200 thermostat instead of 180, or reformulating carnuaba waxes based on VOC content, or changing from freon to whatever we use now, the changes are for emissions purposes.

Even Mobil 1's own answer seems to imply that 5W40 turbo diesel oil is a pretty good choice for performance cars.......

danno, you ask great questions...

JMatt, you kick ass on good info. I was just reading about this on a dyno page and was going to switch, but I still felt uncomfortable regarding the SRT's. Now I'm switching for sure.