When did GM start having cam issues due to a lack of zinc in oil? Late 70s? Bought some EOS yesterday.
Taylor55 said
Aug 20, 2022
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
DonSSDD said
Aug 20, 2022
I bought 500 liter container, I use that at every oil change in the 409.
LT1Caddy said
Aug 20, 2022
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..
DonSSDD said
Aug 21, 2022
DonSSDD wrote:
I bought 500 liter container, I use that at every oil change in the 409.
ML, not liter of course.
JC2+2 said
Aug 21, 2022
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.
I'll check my parts guy to see if the # is still good...
THX
4SPEED427 said
Oct 12, 2022
992869 is still a valid, available GM part number for EOS, yes.
68vert said
Oct 12, 2022
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.
Does the current available EOS contain the ZZD zinc additive?
www.eastwestenviro.com/sds/2014-05-12_SDS_Cleaner-Engine-Oil-Supplement_ACDelco.pdf
Al
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..
ML, not liter of course.
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.
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.
I'll check my parts guy to see if the # is still good...
THX
992869 is still a valid, available GM part number for EOS, yes.
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.
