Got on it & BOOM

patrickt · #1 (**permalink**) 10-07-2008, 08:05 AM

Here's the old EOS. Note the increase in the detergent package. It has gone from roughly 8000ppm to almost 32,000ppm. A four fold incease; that is significant.

Search terms to help find this thread in the future: GM EOS, E.O.S. old versus new, ZDDP, Zinc content, Extended Oil Service, phosphorous, flat tappet wear

vettestr · #2 (**permalink**) 10-07-2008, 08:56 AM

Patrickt,
In reading your post you mention the 4 fold detergent package numbers in the NEW formula. Then said "Of course, having too high of a detergent level defeats the purpose of the additives." Are you thinking the amount of detergent in the new EOS negates the benefits or just that it it much higher than the Original?

patrickt · #3 (**permalink**) 10-07-2008, 09:23 AM

Quote:

Originally Posted by vettestr

Patrickt,
... Are you thinking the amount of detergent in the new EOS negates the benefits or just that it is much higher than the Original?

I don't know if the increase in Ca now offsets the benefits of the increase in ZDDP. The literature suggests that an increase in calcium detergent (as opposed to Ca/Mg or Ca/Mg/Na detergents) increases wear. Likewise, the literature also suggests that "too high a detergent level" is not good for your engine. I don't know why GM had to change it to begin with, but evidently they did.