Originally Posted by BB427

Okay did a little research and here is a PM response from buddy at the chevelle forum who agrees with you on the diesel oils. I happen to value his opinion so I'll post his response to me.


"* PENNZOIL GT 25W-50(NOT 20W-50) RACE OIL .,IT HAS A VERY HIGH LVL F ZDDP (1500PPM+) GOOD FOR THE FLAT TAPPET CAM IN YOUR 427.NOT ALL STORES CARRY IT BUT MOST CAN ORDER IT OR YOU CAN ORDER IT FROM SUMMIT/JEGS,SHOWS UP IN 2-4 DAYS DEPEDNING WHEN YOU ORDER IT. IT GOOD DOWN TO APPROX 40 DEG F,BUT NO COLDER.

* CHEVRON DELO 15W-40 IN A BLUE COLOR GALLON CONTAINER THATS AVAIL IN MOST AUTOZONE/ADVANCED AUTO/PEPBOYS /WALMART STORES.IT'S A LITTE LIGHTER THEN THE 25W-50 PENNZOIL SO ITS GOOD DOWN TOO APPROX 15-20DEG F SO IT COULD BE USED IN PRETTY COLD WEATHER AND IN HOT SUMMER TOO. THIS OIL ALSO HAS A DECNT LVL OF ZDDP THOUGH NOT AS MUCH AS THE PENNZOIL BUT IS STILL ADEQUATE @ APPROX 1350PPM ZDDP.

* BRAD PENN 20W-50 ,THEIR SITE CLAIMS APROX 1400-1500PPM ZDDP BUT I HAD IT TESTED AND IT CAM IN SUBSTATIALLY LOWER THEN THAT WHICH COULD HAVE BEEN A FLUKE OR BAD TEST,DONT KNOW. BUT THET CALIM A HI ZDDP LVL AND IT THATS HOLD TRUE THAT IL WOULD BE GOOD TOO IN 20W-50,IT CAN BE BOUGHT ON EBAY AND ORDERED FROM SUMMIT/JEGS.

* VALVOLINE NSL(NOT STREET LEAGL) 20W-50 RACE OIL THAT HAS APPROX 1300PPM ZDDP. HAS TO BE ORDERED FROM SUMMIT/JEGS/OR LOCAL STORE. BUT IT HAS LOW DETERGENT LVL SO FREQUENT OIL CHANGES ARE REQUIRE,CANT GO 2K-3K MILES WITH THAT OIL.

* OR YOU CAN GET THE FOLLOWING OIL ADDITIVES THAT BOOST THE ZDDP(Zinc & P) THAT YOU CAN ADD TO ANY 20W-50 OR 15W-40 SM RATED OVER THE COUNTER PASS CAR OIL SOLD TODAY THAT WILL HAVE A LOWER ZDDP LVL THAT NEEDS THE ZDDP OIL BOOSTER ADDITIVE ADDED FOR PROPER FLAT TAPPET CAM PROTECTION.

- CAM SHIELD (BUY FROM CAM SHIELD SITE)

_ ZDDPLUS BUY FROM EBAY/EASTWOOD CAR RESTO TOOL CATALOG/FROM ZDDPLUS SITE.

BTW,NO ALL IS TRUE ABOUT WHAT THE CAMSHILED AND ZDDPLUSSITES SAY ABOUT THE DIESEL OILS SOLD TODAY THAT ARE CJ RATED. THOSES NEWER GENERATION OF DIELS/GAS ENGINE OILS HAVE LESS DETERGENT BECASEU THE NEWER GENERATION OF DIESEL ENGINES RUN CLEANER THUS NOT REQUIRING AS MUCH DETRGENT IN THE OLFOR THOSE ENGINES. CHEVRON ALSO REC THAT CJ RATED DELO 15W-40 OIL FOR ALL GASOLINE ENGINES RIGHT ON THIER SITE. "

Originally Posted by speedreed8

this is response about royal purple, that i use. just fyi

Don,

The RP 10W40 is the right choice for your L82 and has a very stout antiwear
package as it meets the API CI-4 / SL Service Classifications. It has 1300
ppm of zinc / phos and also contains our Synerlec advance additive
technology which increases the ability of the oil to prevent metal to metal
3-4 times better than other conventional or synthetic oils.
We've got you covered with our RP 10W40 just like we have the drilling rigs
and some oil field service companies that use our RP 15w40.

The oils to avoid in your older flat tappet cam engine are the newer API SM
gasoline oils in the multiweight 20 or multiweight 30 viscosity grades or
the new emissions compatible CJ-4 diesel engine oils for 2007 and newer
diesels. These two classes of oils now must have reduced antiwear additives
packages to supposedly increase the life of the emissions exhaust
components.

Thanks for the email and for using RP.

David

Royal Purple Inc
David Canitz
Mgr - Tech Services
1 Royal Purple Lane
Porter, TX 77365
281.354.8600
281.354.7600 fax
713.725,7207 cell
dcanitz@royalpurple.com