[KULTULZ]

Originally Posted by dmsfrr

Ok, still trying to figure it out, just for the sake of continued discussion & possible clarity.

What I'm getting from these pages is that ZDDP is still a useful/needed ingredient in motor oils for older gasoline powered vehicles built before emission equipment was required.

BUT just because you buy an oil (in this case a generic 'diesel engine' oil) that you thought had enough ZDDP in it, Do not assume that it does without checking the label / ingredients, if it's listed.

An engine oil marketed specifically for 'Classic' or 'Older' vehicles, or one that points out its higher formulated ZDDP content will likely be a better bet to use.

The advertiser choice I used was once JOE GIBBS (TRUE) RACING OIL (NASCAR). Competition usage only. I used it to hopefully show a true racing oil. It is used for competition only.

VALVOLINE ZR-1 is a HIGH PERFORMANCE oil, meant for older tech (street/mild racing). VALVOLINE also offers TRUE racing oils. A true RACING OIL is not designed for street engines as there are less detergent/dispersant additives. It is usually dropped frequently for engine tear-downs. RACING OIL is an advertisement gimmick. You have to know what your car requires regarding lubricants.

Zinc and phosphorous levels were decreased to comply with new emission laws and new tech engines not needing it, along with a ban on heavy ZDDP oils as they would foul the newly designed convertors.

The go-around then was to use DIESEL OIL as it still offered the protection if spec'd for both gas and diesel engines (SHELL ROTELLA-T was one). EPA then brought about particulate traps and a cleaner burning diesel engine(s). Diesel oil formulation was changed. New diesel does not require the old oil as they also have gone to new tech (rollers cams for one).

Somehow, a few refiners were able to introduce high ZDDP oil again, but there was a warning on the containers to not use in new tech. Same as HP PARTS - MAY NOT BE EMISSIONS LEGAL - OFF-ROAD USAGE ONLY.

Does this help? If not, yell out.

https://sharena21.springcm.com/Publi...2-ac162d889bd1

https://www.valvoline.com/our-products/sds

https://www.api.org/products-and-services/engine-oil

http://www.pqiamerica.com/resourcero...viceclass.html