[uneasyrider]

I understand about the flat tappet cam and new oils stuff on cam breakin but if I understand right there are people on here using EOS as an oil addative after breakin. Is this the case? If so how much per qt of oil?

Thanks,

[getmygoat]

I've got a new 400 with about 100 miles on it. I didn't read the stuff on cam break in and new oil until after I broke in my cam... Oh well.

I changed the oil to rottella and added a bottle of EOS (one bottle for 5 quarts).

My understanding is that if you use rottella, you don't need the EOS, but I figured I would double my protection for the first 100 miles.

I'm about due for an oil change and will probably just use rottella w/o eos next.

[Rocky Rotella]

Per Nunzi's suggestions, we've been adding a one-pint bottle of EOS (No. 1052367) to 6 quarts of oil at every change interval for years. Recently broke a cam in with it too. No problems yet!

[uneasyrider]

Thanks guys! If Nunzi (aka Dr. Pontiac ) says so I'm DOING IT!!

[cb78]

I`ve been using it regularly since my build also.

[cb78]

double post

[seb455]

Rotella formula changed for 2007. ZDDP levels I think are much less now than 6 months ago. Might want to check on this...

[Will]

Rotella is no longer any better than any other oil as far as the zddp levels go. If you choose to use it (it's still a good, heavy duty oil), you need to be supplementing it, and a bottle of EOS at each oil change is a great way to do that.

[mwritter]

Anyone found an affordable way to buy the EOS in bulk? I can't seem to find it for less than $10.99 a bottle plus about $9 shipping. I'd like to pick up a case or more if possible. Hoping to find it cheaper than at the dealer.

[Grant Miller]

Or is there something similar and cheaper... like maybe the Clevite bearing assembly lube? How does STP compare to EOS as an alternative? Rislone?

[satman]

I called the Chevy dealer’s parts dept near my house, they brought several bottles in for me in about 3 hours. $10.00 per bottle, but no shipping charges

[cb78]

the chevy dealer near me sells it for $9. I just go and pick it up.

[Region Warrior]

Part #105237

GM suggested list - $9.29
whsl - $6.97

[PLAY400]

Paying the same $10 here in Canada except with cheaper Canadian $$$. I figure the extra cost of the oil change is cheap insurance.

[Paul Westcott]

Great. Now Rotella has apparently dumped the zinc. I would hope that someone in the automotive aftermarket will step forward with an affordable oil additive to replace the missing ZDDP for those of us with flat tappet cams. EOS is fabulous stuff, but a bit expensive. Perhaps half a bottle EOS per oil change would be sufficient for anything other than break in? Still, GM might not be making EOS for too much longer either. Despite claims to the contrary, I have yet to see definitive proof that regular STP will do the job. Any other additives out there with ZDDP or equivalent?

[Will]

Have you seen any claims that STP *won't* do the job? It has high levels of zddp in it. What I don't like about it is that it increases oil viscosity.

And what leads you to believe that GM won't be making EOS much longer? Got some inside info you want to share?

[455_regal]

For every 100 guys using EOS there are 100 not using it and are fine, Just keep your oil changed, have the right springs, cam spaced right. EOS or not, if the lobes go odds are you have other problems, its not because you didnt use the additive. I ran my motor for 6 years with the cheapest oil you could buy, I took the cam out last fall and sold it on here, it looked like new.

[Will]

And up until about two years ago the cheapest oil you could buy had plenty of zinc in it.

Certainly not all cam failures are due to lack of additives in the new oil formulations, but I bet some are. There has been a recent rash of cam failures, even when everything is setup right, more than we've seen in the past. Even the cam manufacturers are publishing information about the new oil formulations and recommending additives to increase zddp levels in oil, which have been dramatically reduced with the latest service specification. If the cam manufacturers are putting this information out there, which they didn't do in the past, then it's a good bet that something has changed. When it's well known that zddp levels in oil have been reduced due to new emissions regulations, why wouldn't this merit a change in the way we do things to protect our expensive investments?

Even if adding EOS or STP doesn't help, it sure isn't hurting, and given that I might change the oil in my Pontiac 3-4 times a year max, what's an extra $10 at each oil change?

[Paul Westcott]

Originally Posted by Will

Have you seen any claims that STP *won't* do the job? It has high levels of zddp in it. What I don't like about it is that it increases oil viscosity.

And what leads you to believe that GM won't be making EOS much longer? Got some inside info you want to share?

I've used STP in the past, but I don't recall specific info on the label saying that it definitely contained high pressure lubricant additiives like ZDDP. If it does, great! I can live with the higher viscosity. Where did you get your info on STP and ZDDP?

My local GM source of EOS "hinted" that EOS may not be around forever -I guy, one opinion. Reason: The major auto mfgs. don't do flat tappets anymore, so why keep making additives for us "old technology" types? Mopar discontinued their EOS.

[Jagtec1]

I add STP to my Rotella.