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ZDDP oil additive

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I looked up the material safety data sheets (MSDS) for various Castrol Oils as they have the ZDDP concentrations on them (as a range in Section 15).

GTX 20W-50 High Mileage - 1.38 to 2.74 (I think these are in %)
GTX 20W-50 "Low Mileage" - 0.69 to 1.36%
GTX 20W-50 Synblend - 0.69 to 1.37%
Edge 20W-50 for Classic Cars - 0.57 to 1.14%

According to the oil writeup at Moss Motors,
<div class="ubbcode-block"><div class="ubbcode-header">Quote:]Which oil should you use after the initial 20-30 minute break-in period?
You have two options. You can use an oil formulated for vintage engines. They have the appropriate levels of ZDDP (0.12% or 1200 PPM seems to be an average). They also have additional detergents and anti corrosion agents to help protect the engines that tend to sit for long periods of time.
If you prefer, you can use an API SM oil with 0.08% ZDDP, and add ZDDP to it. Mix it carefully to obtain the desired 0.12% ZDDP by weight (1200 PPM). Remember that levels of ZDDP over 0.14% (1400 PPM) will cause chemical corrosion of the tappet and lead to increased wear over time.[/QUOTE]

So, it seems as though the GTX 20W-50 High Mileage has the most ZDDP, and all the oils listed above have an appropriate concentration of ZDDP without adding more.
 
John,

Fantastic!
That's just the sort of input I was hoping someone would share.

Interesting, Moss's write-up, adding too much ZDDP is not a good thing. Good to know!

"Remember that levels of ZDDP over 0.14% (1400 PPM) will cause chemical corrosion of the tappet and lead to increased wear over time."

GTX 20W-50 High Mileage - 1.38 to 2.74 (I think these are in %)
GTX 20W-50 "Low Mileage" - 0.69 to 1.36%
GTX 20W-50 Synblend - 0.69 to 1.37%
Edge 20W-50 for Classic Cars - 0.57 to 1.14%

Am I missing something? The above are all over 0.14% ?

Cheers,
Roger
 
Eastwood Products https://search.eastwood.com/search?w=zddp
carries zddp additives, and I believe shipping is/may be included.

Haven't used it as yet but I share the same point of view/concerns as AUSMHLY.

Also not prepared to start using synthetic oils. I don't need to see the Exxon Valdez parked in my laneway.

Cheers and Merry Christmas to all
DB
 
AUSMHLY said:
John,

...

Interesting, Moss's write-up, adding too much ZDDP is not a good thing. Good to know!

"Remember that levels of ZDDP over 0.14% (1400 PPM) will cause chemical corrosion of the tappet and lead to increased wear over time."

GTX 20W-50 High Mileage - 1.38 to 2.74 (I think these are in %)
GTX 20W-50 "Low Mileage" - 0.69 to 1.36%
GTX 20W-50 Synblend - 0.69 to 1.37%
Edge 20W-50 for Classic Cars - 0.57 to 1.14%

Am I missing something? The above are all over 0.14% ?

Cheers,
Roger
Click to expand...

I think the answer lies in the way the concentrations are measured. I'm pretty sure the concentrations quoted by Moss and others are the concentration of zinc, rather than that of ZDDP. The reason I think that is:
<ul style="list-style-type: disc">[*]Moss quotes lab methods for measuring ZDDP in oil that will really only measure the zinc concentration, and [*]ZDDP can have different molecular weights depending on the alkyl radicals used. Each of the four alkyl radicals in CAS Number 68649-42-3 can have from 1 to 14 carbons in it.[/list]
ZDDP using the ethyl radical (two carbons) has a formula weight of 435.55. Zinc has a formula weight of 65.39. So, if the ZDDP is the ethyl version and the percentage given by the manufacturer is 1% (10,000 ppm) the zinc concentration is:

10,000 * 65.39/435.55 = 1,500 ppm

Now, different manufacturers will use different alkyl radicals to refine the properties of "their" ZDDP, and they won't tell you the properties because it's a secret.
 
Hoghead--

Diesel oil have very recently been reformulated with reduced levels of zddp and phosphorus.
 
A good racing oil [ Valvoline ] is less expensive.---Keoke
 
I don't add anything,I use Valvoline VR-1 oil,which has ZDDP as one of the components of the oil.My 1275 has very good oil pressure and I like Valvoline products.
 
reddsprite said:
I don't add anything,I use Valvoline VR-1 oil,which has ZDDP as one of the components of the oil.My 1275 has very good oil pressure and I like Valvoline products.
Click to expand...

:iagree:------------Keoke
 
My Camshaft & Lifters just arrived from the camgrinder where I had the camshaft reground and the lifters resurfaced. All items heat checked, nitrided and parkerized.

He provided a sheet from Mobile with Mobil 1, 15W-50 "circled".
Phosphorus Level, PPM is 1200.
Nominal Zinc Level, PPM is 1300.

Special handwritten note says ZDDP(which is underlined), must be above 1200 P/M and that most oils are below 900 PPM.

Product Description: Boosted, higher viscosity, fully synthetic formula desighned for performance vehicles.

Recommended Consumer Applications: HT/HS applications. Racing and Flat tappet applications.
 
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