kirban 2 cents worth
There still seems to be some confusion about zddp....
First Brad Penn is a good oil....however it does not have 1,800 ppm which is what was in the oil under the SF category when our cars were new. Look at your visor decal clearly states SF...and SF produced 1,800 ppm of zddp.
We are now into SM oil category and by law (EPA) can only contain 600-800 ppm. Quite a drop in protection.
Now take this into consideration....during the first 1,000 miles of driving....zddp depletes at a faster rate. so...if you are starting with say 1,200 ppm by the time you drive 1,000 miles ppm has really dropped and in performance applications wear can increase on extreme pressure points.
Richard was able to find out what was in the oil from GM in a new ZO6 Corvette that had a mere 400 miles on it when the owner removed it for hist first oil change....tested it had 3,000 ppm of zddp content....the Mobil One that was then put in SM category by law 600-800 ppm....quite a difference.
The bottom line is this.....
There is nothing magical in the 4 ounce bottle only the correct concentration of zddp to mix with a normal 4-6 quart oil change of any current SM oil conventional or snthetic to bring it back to were it was in 1986
Engine rebuilders are very well aware of the issues especially if they still rebuild engines using flat tappet cams.
I stand by my original statement....if you want to keep things simple and use an oil you have always used and one that is readily available in your local stores....buy it...add one bottle of zddplus and you can rest assured in a normal 4-6 quart oil capacity of having a guarenteed 1,800 ppm of zddp.....
This is especially critical if you have any type of modified engine.
I appreciate all the private pms.....
denniskirban@yahoo.com
We have over a dozen tech briefs available to back up this product. They appear on our website or you can send me your address we will be glad to send you a set of them. The toughest group of doubters I have faced is a seminar I did for a Corvette club about a year ago.
Concerning Scotts comment about the quality of oil...that is not the issue it has to do with the star burst symbol which is basically a date code....if the star burst has the SM lettering don;t matter if its Mobil One or Valvoline or Walmart oil....it can ONLY have between 600-800 ppm of zddp ....by law period....
It is a misconception if you believe that a named oil is better....than a no-name brand as far as zddp content is concerned.
Oil until last several years was always so supposed to be backwards compatible...heck I never knew or paid any attention to the star burst either and until 5-6 years ago it didn't matter...
Remember everything happens gradually....