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Old 08-22-2007, 04:03 PM   #1 (permalink)
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The Good Stuff In Shell Rotella T Oil Is Gone:

I have been using Shell Rotella T 15-40 diesel oil in my gasoline engines for a few years now because it is one of the only oils with zinc in it that is left anymore. Chevron Delo is was also loaded with zinc, but no more according to this:
LUBE REPORT: Chemical Limits Loom for Diesel Oils

I guess I'll start using STP again.
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Old 08-22-2007, 04:49 PM   #2 (permalink)
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Re: The Good Stuff In Shell Rotella T Oil Is Gone:

What did the zinc do? Fight rust?
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Old 08-22-2007, 05:00 PM   #3 (permalink)
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Re: The Good Stuff In Shell Rotella T Oil Is Gone:

Eh, no effect on me, we have over 500 gallons of the good old stuff on hand (I work at a truck shop, painting tractors etc) Looks like I better get about 30 gallons of private stock! lol
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Old 08-22-2007, 06:17 PM   #4 (permalink)
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Re: The Good Stuff In Shell Rotella T Oil Is Gone:

The zinc compound abbreiviated ZDDP, is an extreme pressure additive that helps keep flat tappet camshafts from wearing out.

About a year ago, all gasoline oils went from the old SL spec to the new "emissions" SM forumulation. This is the grade that is in the little circle on the back of the bottle.

Anyway, this was done because it was found that the anti-wear additives -could- cause problems with catalytic converters if the car burned a lot of oil. This mostly concerns cars with over 100k miles.

The new oils have a lower concentration of zinc and phosphorus compounds. Bad news on the Valvoline Racing Oil... It held onto the older SL rating for a while, but the latest stuff I saw at the store had the emissions SM rating. This was both the 20w50 and the straight 50.

Diesel oil has traditionally had more anti-wear compounds than gas oil. However, with the current low emission diesel engines that also use a form of a catalytic converter, their oil has also changed. The old pre-emissions oil had a CI-4 rating. The new stuff has a CJ-4 rating. The new rating wasn't done THAT long ago, and some CI-4 oil is still on the shelf. THIS is the stuff to use in flat tappet engines! CHECK THE RATING!

As for additives. EOS, and every other "street" oil supplement containing large amounts of zinc and phosphorus compound have been DISCONTINUED. General Motors EOS and the 4-cyl STP in the red bottle are now out of production. If you want these additives, you've got to turn to the race shops. Comp Cams sells a very popular additive. It's part number 159. Crane also offers their additive.

My advice is to stock up on CI-4 diesel oil while some of it is still out there. Some stores still have CI-4 oils. Shell Rotella 15w40 went to CJ-4, but the straight 30w is still CI-4. About a month ago, I saw Rotella CI-4 15w40 in 2.5 gallon jugs at Tractor Supply. If you have a flat tappet engine, use diesel oil, and try to use the CI-4 stuff.

As for affordable synthetic oil... All Mobil 1 has the current "emission friendly" SM rating EXCEPT their "High Mileage" oil. This still has the older SL rating. It is available in 10w30 and 10w40, and I just purchased some at Wal-Mart for $19.95 for the 5-quart jug.

Of course Royal Purple is a "take no prisoners" oil. If you truly want the best, and don't mind spending the money, this is the stuff for you.

Below is a link that has a chart of different oils and their additive amounts.

Good Reading!

Oils: What motor oil should I use? Which oil is best for my Porsche or aircooled engine?

Here's an Austrailain motor oil test. Just keep in mind, this is just a test for extreme pressure protection.

http://www.animegame.com/cars/Oil%20Tests.pdf

Good Luck!
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Last edited by n2omike; 08-22-2007 at 06:21 PM.
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Old 08-22-2007, 09:21 PM   #5 (permalink)
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Re: The Good Stuff In Shell Rotella T Oil Is Gone:

Penn Grade 1 Racing Oil

BRAD PENN® PENN-GRADE 1®
Partial Synthetic SAE 0W-30 Racing Oil
The Partial Synthetic SAE 0W-30 is a high performance low viscosity racing oil tailored to maximize horsepower in engines that use this type of low viscosity engine oil. It contains strong detergent, dispersant and ZDDP antiwear additives to help protect critical engine parts free of deposits in highly stressed racing engines.
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Old 08-22-2007, 09:23 PM   #6 (permalink)
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Re: The Good Stuff In Shell Rotella T Oil Is Gone:

WOW, I missed all that happening. I guess I need to get some new trade magazines. I dont run a flat tappet cam and probably wont but I thought I knew more about oil than I do. Thanks for enlightening me. I currently use Napa oils in my shop, made by Valvoline and have had good luck with it. Many of my customers have over 200k on gas and Diesel engines.
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Old 02-17-2009, 08:11 AM   #7 (permalink)
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Re: The Good Stuff In Shell Rotella T Oil Is Gone:

After reading this article, I scrolled on down to the questions. In the contents of the answer to "Is there moly in my motor oil? Is moly bad for my engine?", it says "ZDDP, although forming good anti-wear films, increases friction...". There are also other answers that cast doubt about EOS, ZDDP, STP, and other additives. This is also turning into quite a debate on another site I frequent. It would be nice to find out what exactly will protect flat tappet cams and top piston rings in performance-type engines. One statement in this article even claims that "extending oil change intervals can increase the protection of oil, in some cases".

The article is in the link n2omike posted regarding Porsche engines.

Last edited by 60smuscle; 02-17-2009 at 08:23 AM. Reason: addition
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Old 02-17-2009, 08:26 AM   #8 (permalink)
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Re: The Good Stuff In Shell Rotella T Oil Is Gone:

"It's times like these when I think I've lived too long."

They mess with our food, water, now our oil?
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Old 02-17-2009, 02:43 PM   #9 (permalink)
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Re: The Good Stuff In Shell Rotella T Oil Is Gone:

I got off the whole oil kick a long time ago, it is bad for mental health. I use synthetic oil of every brand, whatever is on special that month I change my oil.
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Old 05-15-2009, 04:47 AM   #10 (permalink)
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Re: The Good Stuff In Shell Rotella T Oil Is Gone:

Quote:
Originally Posted by F15Falcon View Post
I have been using Shell Rotella T 15-40 diesel oil in my gasoline engines for a few years now because it is one of the only oils with zinc in it that is left anymore. Chevron Delo is was also loaded with zinc, but no more according to this:
LUBE REPORT: Chemical Limits Loom for Diesel Oils

I guess I'll start using STP again.
Hi guys, new to the site. PJ

I use Valvoline racing oil. Supposedly still has zink in it.
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Old 05-15-2009, 06:56 AM   #11 (permalink)
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Re: The Good Stuff In Shell Rotella T Oil Is Gone:

Does that also mean that those big rigs are now going to get less than the humongo average miles they got before? Aren't they still considered good even with 300-400k miles on em?

What does the partial synthetic do to a worn out leaky engine? Does it all run out quicker? Asking because I thought I'd heard that a person shouldn't put all synthetic in an old engine or it will cause it to leak. Or is this an old wives tale or is there some truth to this? I don't think I'd go to the expense in my leaky engine, be even more like pouring money down the drain but curious if there are only minor leaks.

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Old 05-15-2009, 07:44 AM   #12 (permalink)
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Re: The Good Stuff In Shell Rotella T Oil Is Gone:

The reason the big trucks go 400K+ miles before going to the scrap yard is because they are almost all highway miles, they pull they coast they pull they coast, they are rarely taken into off road situations more than a couple moments each month of their life, Etc...

The trucks we run on dirt roads and around our coal mines out in Utah etc, were 200K and under before new motors were needed.... Far different than driving highway's for 99.8% of it's life...
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Old 05-15-2009, 09:07 AM   #13 (permalink)
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Re: The Good Stuff In Shell Rotella T Oil Is Gone:

The diesel fuel, itself, is also a lubricant... which is one reason those engines go for so long without wearing out their rings and cylinder walls. However, many don't like the new ultra low sulfer formulation. The ultra low sulfur, and all the emissions that go with it have effectively put an end to the upcoming rise of more efficient diesel fueled vehicles here in the states.
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Old 05-15-2009, 09:25 AM   #14 (permalink)
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Re: The Good Stuff In Shell Rotella T Oil Is Gone:

And don't forget our guns. I guess we need to try and stock up on good oil just like the high cap mags
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"It's times like these when I think I've lived too long."
They mess with our food, water, now our oil?
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Old 05-15-2009, 09:34 AM   #15 (permalink)
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Re: The Good Stuff In Shell Rotella T Oil Is Gone:

I haven't been able to find ANY ammo for the last 4 months! None of the stores have anything left of any funability to shoot!
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