66luvr

SOLD,

Thanks,

oldcutlass

I don't know the difference between the old stuff and the new. The new goes for $25/26 per pint. The old (although not as old as yours) is advertised on ebay $15.99 - $120. Doubt they'll get the $120.

D. Yaros

This is what is great about this forum, always something new to learn about!

Pray tell, what is GM EOS? Is it STP in a different container? What is it supposed to do? What is it's use?

What makes it worth $16 to $120/pint?

frankr442

EOS -Engine Oil Supplement, is an assembly lube for engine builds and start up break-in. Don't know why they called it "supplement" because they tell you not to use it as an oil additive.

66luvr

I disagree with the warning you mention, so I added pictures of the back of the bottle. Take a look and see if you think they are telling you not to use as an oil additive. I can't read that into the info.

redoldsman

When I worked for a Buick dealership back in 64-66, I used to sell that stuff in a metal quart can. It was good stuff and more like Bardahl. I just checked and Amazon has a 12.8 ounce bottle of Bardahl for $14.66.

OLDSter Ralph

"Back in the day", EOS was good stuff. You smeared some on the cam bearings, cam journals and poured the rest on the cam lobes. You poured it on and what didn't cling to the cam went down in the crankcase. You fired up the engine and drove it to break it in. None of this present day "magical" cam lubes, throwing a pinch of salt over your right shoulder, four "Hail Mary's" and running the engine at 2000-2500 rpm's for 20 minutes.
But, maybe the valve spring pressures are higher, camshaft hardness is not as deep and the motor oil has a lot less ZDDP.
.....Just my two cents worth

BillK

Used to be the trick back many many years ago. There are many other options available now days that are probably better. You might find someone who insists on "Old school" chemicals but personally I would not pay more than what you can get modern stuff for.

redoldsman

If it was some of the stuff in the metal cans I mentioned, I think it would have added value but in plastic bottles I think was ever suggested retail is would be what it is worth.

Charlie Jones

Sent PM

frankr442

I certainly can't argue with what's on that old label. I was only going by what's on the back of the current bottle.
(in bold letters) "GM DOES NOT RECOMMEND THE USE OF THIS OR ANY PRODUCT AS AN ADDITIVE TO ENGINE OIL"
Again, their caps, not mine.
There has been a number change, so maybe we can't compare the two.

D. Yaros

Ok, break-in oil, got it. Thanks!

I cannot remember what I used for break-in oil back in the early '60s when I rebuilt the 265 c.i. V8 in my 55 Chevy?

redoldsman

The first SBC I rebuilt was in 1963. I bought it out of a junkyard and rebuilt it to go on my 40 Ford. I was 17 and asked a lot of questions. All I remember doing was just putting motor oil on the bearings when I assembled the engine. I had no torque wrench and used no break oil. I didn't prime the oil pump but somehow the engine stayed together and I drove the car my senior year in high school. One thing I remember mechanics doing when they rebuilt a motor and installed a new one was filling the oil pump with vasoline. The first time I saw this I wondered what the heck they were doing. I don't think that happens anymore.