IMHO, the "blue-capped" STP additive would be just as effective and cheaper.

Is this the one?
http://www.stp.com/oil_oiltreat.html

TIA

What a contrast to the ZDDPlus website. One products website has so many reasons to buy and the other has absolutely none...

Hi Nathan,
Yes, that is the one. Right below the yellow tag, there is a "* ZDDP anti-wear agents" disclaimer. It looks like STP changed their web site. I thought they had the specs on the site as to the amount of ZDDP in the treatment. I use about 1 1/2 bottles, per oil change, but I have about a 13-15 quart oil system capacity (large front cooler). How much you add depends on the amount of ZDDP in your motor oil. I use Valvoline VR-1 20-50W which has about 900ppm, I believe.
Yeah, the ZDDPlus site looks something a like ShamWow web site! :)

After reading some blogs on the web-o-sphere, it appears the STP "Red" has even higher levels of ZDDP.

NOTE: This info is now superseded - check the date of the original post. Use Brad Penn and be done with it, is my simple solution.

agreed, except I use Swepco. Ether way, end of discussion (unless they change the formula):eek:

Any oil additive is questionable compared to an oil that is formulated correctly, right out of the bottle. The ZDDPlus additive was covered in the Ultimate oil thread (somewhere) :-)

Hi Randy,

Thanks for making it clear that the information I wrote is superceded and out of date! :) :)

When I get time, I'll go back into that thread and edit my posts to reflect whats current.

Sure - Actually, I meant that MY quote or paraphrase or whatever I done did was superseded and out of date!

Charles Navarro can (and does) speak for himself, but my take a while ago was that he favors a minimum 1200ppm of both zinc & phosphorus in oil, thought that ~1400-1500ppm is about right & that 2000ppm is too much. Mobil claims 1200 ppm “native” zddp for Mobil 1; Navarro seems to agree, as does Allan Caldwell (Pano, Nov 08.) But avoid the "High Mileage" version of Mobil 1 which I believe has only 1000ppm. Now, 0.5 oz of EOS raises the amount of zddp in one quart of oil by 100ppm; so it would raise the amount in my 13 quart sump by 1/13 as much, or 7.7 ppm. One 16 oz. bottle of EOS would add 32X’s as much zddp (as 0.5oz above) or ~ 246ppm per quart. So, one bottle of EOS, when added to the 1200 ppm “native” Mobil 1 level in my 13 quart Porsche, yields ~1446ppm…just about right. YMMV.

There is alot of hype on this issue as well as the oil issue IMHO. Ill stick with VR1 or GT1... Car has 95k miles, uses about a 1/3 of a quart every 2000 miles, when i remove the valve covers things look freshly polished... so not buying the gospel. just take what the experts say with a grain of salt and buy a good oil... the SL/SJ rules dont apply to 20 w 50 oil.... so there are plenty of SJ oils if you use 20w50 that are fine... incl GT1 and VR1...

Every once in a while, oil technology comes up with something new... I tried LiquiMoly's new Ceratec additive in my '88 Carrera and was very happy with the results. They claim no metal-to-metal contact. (OK, I already own St. Peter's Square in Rome.) But, I got better engine response, fuel economy, the 3.2 ran cooler and it got quieter! Has anyone tried it?
http://www.liqui-moly.de/liquimoly/produktdb.nsf/id/e_3721.html

I would buy a known good 20w50 oil like Brad Penn, Valvoline VR1, Kendall GT1, Swepco, Redline, etc and forget about it.
That seems to be the recommendation of the experts...
altho it does look interesting, go look at the websites for half a dozen oil treatments incl Swepco 505, and they all make the same claims. Whether they really work is the million dollar question...

Here is what Swepco says about its 505...

"An oil improver designed for use in both gasoline and diesel engines to eliminate friction, wear and to improve fuel efficiency. Contains DIMONYL and organic Moly which plates all vital metal surfaces with a friction reducing film. Highly effective anti-oxidant additive. Increases chemical and thermal stability of any oil. Protects expensive turbochargers and reduces friction and engine wear which lowers operating temperatures and improves the fuel efficiency of the engine. Superior protection for turbo charger. Improves high temperature performance of engine oils and extends engine life. "

They all basically say the same thing... right?