[Bmcu] Got ZINC ?

[Adamant]

 Also having been down the trashed camshaft experience, Mike, what is the make of additive that you use?

I was curious about this whole zinc additive and tried some online research. My interest is in super hypergrades (as they used to be called in the UK) specifically 5w50. Overall it does look like they enjoy a greater zinc content but information I have found it impossible to compare. 
CERCLA requires these numbers, but zinc content is shown differently in every document I have checked:
Castrol declares a "concentration" of 0.57-1.14 (whatever that means)
Mobil1 declares 1100ppm, another I didn't write down was shown in lbs!

I did note that regular, common grades of oil do tend to contain much less additive than more performance grades. Some 10w30's had none. One, (Champion new energy 5w30) has 0.5-1.5%!!
BTW, The reason for this is that higher amounts of additive are slowly detrimental to catalytic converters and are not environmentally friendly
-- 
Adam King.

memorablemotorcars at comcast.net wrote:

|I will vouch for the need for Zinc Additive. I lost the camshaft in my
|36 Ford ( 468 Cid) It was a fresh build with a ton of money invested.
|Being in the business I have built hundreds of engines over the years
|and never had a problem. After the failure I contacted Comp. Cams which
|had built the camshaft and got this reply " No zinc additive, no
|warranty" . Zinc additive is needed in every engine unless you have
|roller tappets. I add it to Every engine I touch without exception. It
|was an expensive lesson. 
|Mike Sorensen 
|
|
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