Put the Zinc back into your oil!

GM's EOS (Engine Oil Supplement):



"EOS - Engine ***embly Prelube
Specifically formulated as an engine ***embly lubricant. E.O.S. provides outstanding protection against run-in wear and piston scuffing as well as run-in camshaft lobe and lifter scuffing resulting from insufficient lubrication."

Get yours here:
http://www.gmpartsdirect.com/results.cfm?singlepart=1&partnumber=EOS

It's supposed to put the Zinc back into your oil if used as an additive. There's been lots of "What's the best oil for my old car" discussions lately, and I thought I'd p*** this on.

 

Is this the new one? I have read they were re-formulating it, and it could be hard to find the old stuff.

 

I have used this before,I thought at one time someone had posted it was not going to be sold by GM anymore.
Maybe that was in one of those Pamela Anderson dreams.

 

From the looks of it, it is indeed the new one. From the website:

"Gm has reinstated this EOS and the new number is 88862586. Now Available."

 

I worked at an engine shop where my boss used STP oil treatment in the blue bottle on new engines. I seem to remember him saying it was because of the Zinc in it. I could be wrong but I'm pretty sure that was the reasoning behind using it. You can pick the STP stuff up at any auto parts store.

 

Sometimes they only bump up the content a small amount.You know,2 more parts per thousand and it "Increased Zinc content for 2008"

 

Got some on the shelf....lists for 19.09. Will sell it for 14.00 plus shipping. 'Spensive junk but it works.

 

Thanks, Man! I'll show this to my GM parts guy so he'll know that's its back and he has a number to work with. Appreciate it

 

IIRC they pulled it because the ZDDP content was too high per the feds (that's what I have read and been told, GM hasn't commented anywhere I have seen). So they reformulated it to keep Uncle Sam happy, hopefully it keeps the lobes on the cams still.

 

My understanding is thenew EOS doesn't have ZDDP. The red 4 cyl STP has, but the Blue doesn't. check out www.zddplus.com

 

What happened to adding a quart of rotella?

 

Zinc content has been drastically reduced in Rotella T, too.

 

Does this one have the 'g**** sent' too?

 

I used to run Shell Rotella diesel oil, but they lowered the Zinc (again, for the feds) so I'm back to whatever is on sale. Watching the Sunday ads, I always get Chevron or Mobil for about .50¢ a quart after rebate. That's hard to beat. Purolater oil filters have a .01¢ sale or BOGO from time to time so I really stock up on those.
Running my '63 300 miles a week for a daily driver, I really would like to get the zinc back into the mix.

 

Haven't seen lab results on the new EOS.

The Red bottle STP was not quite as good as the old EOS,
but better than a lot of stuff.The Blue bottle is really thick,the Red isn't.
They also make a white bottle,not as good as the Red.
Red bottle is also not readily available everywhere.

Luckily,I was able to get some of the old EOS.

 

According to a fairly reliable source, the EOS phosphorus content was cut by 50%, the rest of the formulation is the same.

BTW, folks, there are a number of ZDDP compounds available from the various cam makers for break-in that can be used on a regular basis at oil changes...usually in 8 or 12 oz. bottles...here's just one: http://store.summitracing.com/partd...03-1&N=700+4294925094+400078+115&autoview=sku

....works like a charm.

 

The new E.O.S. bottle still has Zinc Dialkyldithiophosphate listed as an ingredient, but doesn't elaborate on the percentage.

 

The "racing" oils are supposed to have higher levels of zinc, also. For example, Valvoline Racing formulas.
Are they also reducing the zinc content in those? Anyone know?

Thanks for the updated info, guys. This is the first I've heard of the reduced zinc contents. I'll probably still use the Rotella T, anyways. I know the 15w-40 is considered the "diesel oil", but does the 10-w30 also have the zinc content of the higher weight oil?

Not meaning to high-jack, just looking for additional info.

Thanks, guys!

Malcolm

 

Mobil 1-15-50 Now Has Zinc.they Are Selling It To Be For Older
Engines. The Stp Company Says That The Blue Bottle Stp Also Has
Zinc. They Are Charging A Premium Price For The Mobil 1.
DEUCEMANAB

 

Mobil 15-50 still has zinc, as does the Castrol full synthetic 20-50. But both are expensive, and with something like a flathead, will probably cause leaks when they start cleaning out all the old **** that's keeping things sealed up. Ask me how I know. Re: the lower zinc content in Rotella and EOS, etc., it doesn't take much, and after a point, more is not better. Best bet to me is to use Rotella or regular 20w-50 with an additive (EOS, Comp Cams, Crane, etc.).

 

www.zddplus.com Need a good stiff shot of ZDDP, click on the site listed here. Trying to get these guys to become Alliance Vendors. They are car guys like us.

 

Thanks for the extra info.
I've been running the 10w-30 Rotella T in the 390 in my Galaxie.
Do you think I should go ahead and run 15w-40 (Rotella)? I don't drive it in temps below 40 and the engine is only slightly worn - doesn't use any oil.

Malcolm

 

Nope. The bottle says, "Harmful or fatal if swallowed; Cherry Flavor."



~Jason

 

No prob, man.

~Jason.

 

How much ?????

10 parts per million doesn't count,if you need 1000.

 

Just find a dealer for Brad Penn racing oil. It's got all the good stuff and is cheaper then buying 5 quarts and an additive.

 

Should we believe that new cams and lifters are designed to work without the zinc?
It's funny how many stories I read about new cam and valvetrain components failing too soon.

 

I'm gonna use a roller cam. That'll show em!

 

They don't make the red bottle STP anymore... that's why its not readily available... it will be gone completely very soon. i use Rotella and a bottle of the blue STP, it has almost as much zinc, and doesn't hurt a thing. The Rotella still has alot of zinc too, just not as much as it used to. Together they'll give you all the zinc you need, and it's the cheapest combination of zinc enriched products you can get IMO... Running this setup in 3 cars with no problems in any of em. Didn't someone post "proof" that all this zinc folklore is a myth anyhow?

 

CI-4 diesel oil is high zinc, the new CJ-4 isn't. CJ is same as car oil.