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GM's EOS oil additive? #1239254 09/19/08 06:10 PM
Joined: Oct 2007
Posts: 70
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Twin Offline OP
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I purchased a couple of bottles from my local GM dealer. 16oz per bottle. I plan on using it in my 06 silverado 4.8 v8. Would you use the whole bottle or half of it in a 6qt. capacity oil pan.I'm trying it because I heard it has great anti wear properties.

Re: GM's EOS oil additive? [Re: Twin] #1239261 09/19/08 06:25 PM
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Steve S Offline
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EOS is for the first time a new engine is fired up Especially cam in block with a non roller camshaft . It is not needed at all in your engine ,a full can will have way too much additives and can lead to combustion chamber deposits.

Re: GM's EOS oil additive? [Re: Steve S] #1239405 09/19/08 09:43 PM
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Ken2 Offline
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Just why do you feel that any brand of good motor oil, right out of the bottle, isn't adequate? How many hundreds of thousands of miles do you expect to own your truck, and why do you thing your engine will show significant wear in that period (if less than 300,000 miles)?

Do not think that you or any of us can home-brew better oil than the oil company chemists. If you want better oil, buy better oil.




Re: GM's EOS oil additive? [Re: Ken2] #1239592 09/20/08 07:36 AM
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Gary Allan Offline
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Well, I'll say add an oz or so to your sump. I mean, you bought the stuff, you might as well use it. You should have a few years of supply there.

Re: GM's EOS oil additive? [Re: Gary Allan] #1239605 09/20/08 08:02 AM
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JAG Offline
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I'd add a few ounces per OCI too. Even if it doesn't help anti-wear properties, ZDDP does double duties as an antioxidant (especially hydroperoxide destroyer).

Re: GM's EOS oil additive? [Re: JAG] #1240366 09/21/08 02:48 PM
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Twin Offline OP
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Thanks all for the replies , That's what I was thinking a few ounces per oil change.

Re: GM's EOS oil additive? [Re: Ken2] #5328679 01/21/20 11:46 AM
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bullmtl Offline
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Thank you JAG for the additional info

From: www.slantsix.org/articles/Modern_Engine_Oils.htm

…...Well, the SM spec stipulates Zinc and Phosphorus content of 0.06% to 0.08% (600 to 800 ppm). GM EOS contains 5762ppm Zn, and 6221ppm P, or 0.6%. That means in a quart of EOS, you've got about 0.192 ounce of Zn and P. It's been well documented that a 0.10% to 0.12% concentration of Zn and P is optimal for flat-tappet engines, for example in SAE papers 770087, 831760, and 2004-01-2986.

To achieve 0.11% Zn and P in a 5-quart system, we would want 0.176 ounces of Zn and P. There's 0.192 ounce in a quart of EOS, but there's also 0.08% Zn and P in a quart of SM engine oil (actually, most of them run a little on the high side, as it seems, but we'll use the 800 figure). In 5 quarts of SM engine oil, therefore, you've got 0.128 ounce of Zn and P. Therefore, you're a little under 0.05 ounce short of what you want. Doing out the math and remembering that I've been rounding pessimistically, 8 ounces (1 cup, i.e., half a pint) of EOS would bring most any SM engine oil back within the optimal Zn and P content, which means that a quart of EOS would last you four oil changes. .....


IF THE WHOLE MESS OF AUTO SALES WHERE CORRECTED, your light pickups would be equipped with SERIES diesel hybrids and possibly reach 100mpg eliminating the need for emissions GIMMICKRY

Re: GM's EOS oil additive? [Re: bullmtl] #5328680 01/21/20 11:47 AM
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kschachn Offline
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Never mind, not worth it.


1994 BMW 530i, 251K
1996 Honda Accord, 280K
1999 Toyota Sienna, 430K
2000 Toyota ECHO, 284K
Re: GM's EOS oil additive? [Re: Twin] #5328950 01/21/20 05:39 PM
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Astro14 Online Content
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If this topic interests you, 12 years later, then please start a new thread on old cars, GMs EOS, or whatever aspect of this thread you were trying to resurrect.

Thanks


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