Hi I posted a web site about zddp additive some time ago I bought this product at car show and found this product was not that expensive www.cam-shield.com  check out this web site.               I hope this info will be helpful.   John Del Bene.

Vic.  You asked so here’s my thoughts on diesel oil being used in gasoline engines.  I don’t use it in any shape, form, or fashion in this manner simply due to the high level of detergent and the scrubbing action that particular detergent has on bearings and cylinder walls on a gasoline engine.  This wear doesn’t happen overnight but when tearing down a multitude of these engines and comparing wear attributes when using known oils, the differences in wear is significant and especially on the bearings.

 

The SM API rating has been discussed heavily in the past and essentially any SM oil with over 30W in its weight classification does still have the SJ amounts of zinc/phosphorus present meaning it’s still good for the older vehicles without the use of additives.  For this reason, most engines leaving the shop are supplied with 10W-40 oil with the recommendation to stay on this particular weight of oil.  I’m in Texas so I can get away with this in the winter months.

 

As Jim (57fairlanepost) mentions, typing in ZDDP in the search bar located at top of the page will bring up past discussions on the subject and some excellent information regarding modern oils.  Here are links to all three pages of just one thread in particular.

http://forums.y-blocksforever.com/Topic9285-1.aspx

http://forums.y-blocksforever.com/Topic9285-2.aspx

http://forums.y-blocksforever.com/Topic9285-3.aspx

Lorena, Texas (South of Waco)

Ejstith ,  Its not the price,  i live in Florida also ,  and i have not been able to find Zddp................Sam     West central Florida

56 victoria

I have never used anything but Pennzoil in my diesel truck from the time it was brand new goin' on 17 years ago. I used Pennzoil Long Life straight 30 wt. I have never had one minutes problem with the truck in all those years. Pennzoil was bought out by Shell so now I can't find Long Life locally so I switched to Rotella. I guess I'll put that in my '56 also. How much is that additive? I only change oil once a year so it won't put me in the poor house I don't suppose.

Doing Fords for 45 years. '56 Customline Victoria

E.J. in Havana FL

You have a valid point,but at least there is a number of products out there to chose from.My understanding of removing zddp was the adverse affect it had on catalitic convertors so it didn't cause premature wear.Jim

By the way,if you go to the search in this forum ans type in [oil zddp] you will find a wealth of info on the topic.It is all extremely important.Also my understanding of the SM classifiation was ok in the flat tappet engine as long as it was SJ classified also.If there has be a differing opinion please verify,thanks.Jim

I contacted Castrol and got a reply on one of their recommendations for flat tappet cam engines.They make a castrol syntec 20w-50 that has a label on back of container that reads [recommended for classic cars],and states in the e-mail I received[min Zn=0.12=1200 ppm][full synthetic].Iwent to Auto Zone and found the blend recommended,not cheap at 6.50 a qt,but if this is readily available still not a bad choice. Jim

Mobil 1 makes a High Mileage Full Synthetic oil in 10w30 and 10w40 grades with a phosphorous level of 1000 (ILSAC SL Approved) I am currently using Valvoline Maxlife Synthetic 10w30 and adding 1 can of ZDDP. I will be switching to Mobil 1 on my next oil change.

I have been using Rotella for the past two seasons and even though the ZDDP has been reduced I will continue to use it with the Comp Cams additive.  We regularly hit 7000 rpm and hopefully a little more with the new engine and have had no adverse effects so far.  We are open to change and I sure will post it if we notice any bearing damage.

Charlie Burns Laton, Ca (South of Fresno)



BurnsRacing981@gmail.com

I read an article that said the Rotella diesel oil was probably NOT the best choice for gas engines since it was designed for the lower RPM diesels. I'm sure if I look hard enough that I could find an opposite opinion. Ted, do you have an opinion on this?

  Vic Correnti