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Canadian Poncho Homepage -> Canadian Poncho -> General Engine Performance Forum -> GM EOS....
Post Info TOPIC: GM EOS....
LT1Caddy


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GM EOS....
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Does the current available EOS contain the ZZD zinc additive?



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JetRider


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Can anyone answer that? Its been my additive of choice and was thinking i was getting some zinc with this product.

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4SPEED427


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The latest WHMIS info I could find online says it still has zinc.

www.eastwestenviro.com/sds/2014-05-12_SDS_Cleaner-Engine-Oil-Supplement_ACDelco.pdf

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
DonSSDD


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When did GM start having cam issues due to a lack of zinc in oil? Late 70s? Bought some EOS yesterday.

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63 Parisienne sport coupe (The Big GTO), black, maroon interior, 409 4 speed; former owner of a 59 El Camino, 63 Corvette SWC, 62 Chev Bel Air SC.
1963- Pontiac top selling car in Canada

Mahone Bay, NS Still not old enough to need an automatic
Taylor55


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I had a 1979 chev 1/2 with a 305 and the camshaft went out at 18,000 k's. I use a 1/2 can of EOS every time i change the oil in my 55 261. I also advise all my friends with original muscle cars to use it at every oil change

Al

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DonSSDD


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I bought 500 liter container, I use that at every oil change in the 409.

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63 Parisienne sport coupe (The Big GTO), black, maroon interior, 409 4 speed; former owner of a 59 El Camino, 63 Corvette SWC, 62 Chev Bel Air SC.
1963- Pontiac top selling car in Canada

Mahone Bay, NS Still not old enough to need an automatic
LT1Caddy


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Sooooo... It took some time for you guys to get the answer. THANKS

Do we have a definitive answer for the part #?????

That should put it rest....

Thanks again for taking the time to find the answer..

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DonSSDD


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DonSSDD wrote:

I bought 500 liter container, I use that at every oil change in the 409.

 ML, not liter of course. 



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63 Parisienne sport coupe (The Big GTO), black, maroon interior, 409 4 speed; former owner of a 59 El Camino, 63 Corvette SWC, 62 Chev Bel Air SC.
1963- Pontiac top selling car in Canada

Mahone Bay, NS Still not old enough to need an automatic
JC2+2


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Lately Ive been using this Lucas Hot Rod Oil. Designed for the older engines with flat lifters so comes with the zinc.  Im impressed with it. Even dropped the engine temp by close to 10 degrees. 



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'68 Parisienne 2+2 Convertible Matador Red (Resale Red but not for sale).
DonSSDD


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LT1Caddy wrote:


Sooooo... It took some time for you guys to get the answer. THANKS

Do we have a definitive answer for the part #?????

That should put it rest....

Thanks again for taking the time to find the answer..

 This is the bottle I bought at the local AC Delco seller. It gives instruction on the bottle for use on cam breakin on a new engine. 
9A19507F-48A2-40B0-B993-7E29B59864A6.jpeg



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63 Parisienne sport coupe (The Big GTO), black, maroon interior, 409 4 speed; former owner of a 59 El Camino, 63 Corvette SWC, 62 Chev Bel Air SC.
1963- Pontiac top selling car in Canada

Mahone Bay, NS Still not old enough to need an automatic
LT1Caddy


Poncho Master!

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I'll check my parts guy to see if the # is still good...

THX

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4SPEED427


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992869 is still a valid, available GM part number for EOS, yes. 



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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
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68vert


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The oil was changed just before I bought my current car and though it was just premium current spec oil it would be the low zinc variety. As I was concerned about it with the flat tappet cam I decided to add this Lucas TB-Zinc Plus additive and next oil change I'll just use Lucas Hot Rod Oil as JC2+2 mentioned. I couldn't locate the GM EOS as local dealer was closed at the time.  I can't speak for the effectiveness but figured was much better than going without and it appears to be meant for exactly this use; Break in OR as an additive.
Lucas Zinc additive.jpg



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DonSSDD


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Been using EOS since 2003, with a regular oil.

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63 Parisienne sport coupe (The Big GTO), black, maroon interior, 409 4 speed; former owner of a 59 El Camino, 63 Corvette SWC, 62 Chev Bel Air SC.
1963- Pontiac top selling car in Canada

Mahone Bay, NS Still not old enough to need an automatic
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