Oils and ZDDP

www.google.ca/url?q=http://www.alfabb.co...wyH1pGvtwJBz6uRQTwmA

www.mobiloil.com/USA-English/MotorOil/Fi..._1_Product_Guide.pdf

www.google.ca/url?q=http://www.hotrod.co...HvI7jl7s19h6R0Nx8lbQ

www.google.ca/url?q=http://www.enginebui...Z1xpEnJV6AaFJg9slmJw

www.valvoline.com/faqs/motor-oil/racing-oil/

And Finaly
www.lnengineering.com/oil.html

I will check these out and see if my current idea stacks up!

As of right now - I am leaning towards keeping a decent Zinc/Phosphorus level as long as I can find a product that is accessible and well received by most.

So for my next oil change (when I replace the oil pan gasket hopefully) I was planning to switch from Castrol 10w-40 which I believe dropped down to about a 600 or so zinc level, to Shell Rotella 15w-40 which is still around 1200 or more. It seems to be well thought of by many 928-ers and is available at Wal-Mart for 17.00 per gal and also available at Costco. Sounds like a very good oil at a decent price. It is basically a mixed fleet Diesel truck oil, made to last and protect. My only concern is the maybe the formulation with respect to detergents or other additives which may or may not suit long term use in our engines.

It is not really warm enough around here all year to go 20w-50 or I would consider other products as well. I know oil subjects are beat to death in forums, but it is also kind of fun watching the action....and in the process, maybe learn a little or at least be pushed to do your own research and learn a little more than you knew before.

Hey Mike I saw the Rotella at Canadian tire but kept looking.

What I found at the sports shop (mostly for motor bikes) was this.

You guys can give me your thoughts as to if it meets or exceeds what our engines require.







It was not cheep though.
I only change the oil once a year so I guess its not to bad

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I got the royal purple at a locall speed shop for 104$ for a case of 12 litres. Good for the year in my car.Full sythetic handles the heat and the cold better.

928mac - I haven't finished looking through your links, but in one it says the CJ-4 is not what we really want. We want CI-4 rating. It says if the oil has CJ-4 on it or something like "good for lower emissions" etc. then it is likely the new formulation. Check out the last link you sent. The info is a about 2/3 down the page I think.

This is the one I am looking at. Although it is CJ-4 it does claim to have high wear protection.
In fact here is a quote from the Shell site with regards to the CI-4 formulation.

"There was significantly lower wear on the road: Up to 38% less iron wear than Shell Rotella® T CI-4 PLUS SAE 15W-40 and up to 22% less iron wear than Shell Rotella® T3 SAE 15W-40 CJ-4."

www.shell.com/home/content/rotella/products/tpl_pro/

I am pretty sure Amsoil is really good stuff but I am not familiar with that particular grade - maybe someone who uses it can advise on that. I am still doing a little research personally.

Hey Mike I sure like how it shows less ware and better protection with the oil you bought.

I know that our engines call for a high ZDDP rateing and I was hoping this Amsoil had it.

The Rottella I was looking at in Canadian Tire was different

Thanks for the info.