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This is from LN Engineering:

For current Mobil 1 users, Mobil 1 15w50 EP now is an SM formulation, with only 0.09% to 0.10% Zn and P when it's previous SL formulation had excellent levels of both Zn and P! This is even less than what is found in Mobil 1 0w40. I recommend using EOS at every oil change to increase these levels to at least 0.12%. It is worth noting that Mobil 1 V-Twin 20w50 retains an SG classification with unchanged Zn and P levels over 0.14% Zn and P, but for most users, a 20w50 for year round use is unacceptable for cold-startup protection, but as much as twice the price of the normal Mobil 1 oils. Mobil 1 also makes a 10w40 MX4T oil with the same anti-wear additive levels, but I am afraid for cars with catalytic converters, this oil will shorten their life - a small price to pay for additional engine protection.The new SM formulation of Mobil 1 15w50 seems to have in addition to reducing the Zn and P significantly, they also reduced the boron from 226ppm to 72ppm and eliminated all trace of sodium and magnesium, two other known anti-wear additives. It would look like it's an entirely new formulation than the SL it's replacing. I strongly recommend those running Mobil 1 15w50 switch to Mobil 1 V-Twin 20w50, which still is an API SG oil, which has the highest level of zinc found in any motor oil, which adding the boron at levels typically only seen in low Zn and P formulations. This should technically provide the best protection in my opinion. We will be testing their 10w40 4T Racing Motorcycle Mobil 1 formulation to see if it is similar.

Here's a link to their whole article on oil…….it's good reading.

http://www.lnengineering.com/oil.html
 

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That's interesting, thanks for the info. I run a big Comp solid tight-lash FT cam, and am highly concerned about the current oil/zinc situation like a lot of guys are. I use a bottle of EOS at every oil change for insurance.
 

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i heard the same thing.THis circle track guy told me that i think its amsoil is suppose to be the best high quaility oil for the cost.But shell is suppose to make a oil the is $35 a quart made for indy racing.

As for the zinc i heard it was about 90 day ago this started happening.
 

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switch to a roller cam and you don't need to worry about zinc.
Mark.
Are you sure about that? ;) Flat tappet lifters aren't the only spot in an engine where there is high pressure sliding friction. Piston skirts for one . . .

I'm running Shell Rotella 15w40 in mine this year. The diesel oils (for now) still have ZDDP in them
 

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I'm running Shell Rotella 15w40 in mine this year. The diesel oils (for now) still have ZDDP in them
Rotella (and the other diesel oils) that have the CI-4 spec have the traditional level of ZDDP; the new CJ-4 diesel oil spec has the recently reduced level of ZDDP mandated for use in 2008 diesels that have to meet the Tier 2 emissions regulations since they use catalytic converters and/or particulate traps.

Around here, Costco and truck stops still have CI-4.

:beers:
 

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Quaker State Q racing oil has the highest levels of ZDDP both in synthetic and nonsynthetic formulas. I've been using Shell Rotella T in my 396 since wasting a cam during break-in and have had no problems. I have been using Mobil 1 in everything else though,without a problem.

Dan E.
69 SS396 4spd 4.10 posi x66 coupe
 

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Get EOS at your GM parts counter. I bought a bottle a few months ago and it seems like it was about sixteen bucks if I remember correctly. Cheap insurance for us FT users. While the lifter faces/lobes aren't the only friction points in an engine, they are by far the most extreme given the tiny area the pressure is applied. A piston skirt in the cylinder by comparison is a large area and thus a relatively low pressure load.
 

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How does the comp cams stuff compare pricewise. Another option.
 
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