boston951

pk951, The SM is a dead giveaway that there is not the correct level of ZDDP present. It's all right in the article.

rlm328

As stated in the article the ZDDP is reduced in the SM motor oils. Valvoline VR1 oils contain 75% more ZDDP than the SM oils and are still "street legal". Having read other articles on the net, you do not really want to go with a ZDDP additive either as each oil brand tailors the additives for the specific oil it is refined from. So the racing oils and Gibbs oils are the route to go.

The ZDDP plates out on the varios parts which is why it is "bad" for the cat. My original question has not been answered, do the zinc phosphorous oils plate as effectively as the ZDDP oils?

ehall

You'd have to find the precise component make up of a specific product to a specific oil. If the composition of the Z and the P components are precisely the same, than they will work the same. Otherwise, not.
The use of a ZDDP adaditve allows people to use the current standard oils, which are much more affordable and readily available at the local store, rather than being forced to switch oils, or as I do, buy oil by the case, via ground transport from the company. I have to buy from AGIP, to get what I want at a "decent" price...and it isn't cheap.
Personally, I prefer to do it right with one product. If I couldn't get what I want from an oil, I would look into an addative.

ehall

I can only speak for myself, but I've been very happy with it. I know that at one point, special tool was running AGIP in his 500-600 hp 951.

boston951

This doesn't sound like solid logic. If the additive is your only option, then having the ZDDP is better than not. Many reputable sources sell the product without any problems.

I just added the ZDDPlus and feel good about my choice. Racing oil like Valvoline VR1 is certrainly a good option as well.

LFA951

I use Valvoline VR1 20W50 and I am very pleased with it...

pk951

One other option motorcycle oil
Motorcycle oils have higher levels of phosphorus/zinc for enhanced wear protection and the same high-temperature detergent technology for superior wear protection and engine cleanliness, even at elevated oil temperatures. Specifically motorcycle oils for aircooled engines are designed for very high localized oil temperatures and high overall oil temperatures, and typically have high flash points coupled with higher HTHS viscosities and lower noack% losses. As a whole, it would appear that all most motorcycle oils we tested have excellent anti-wear additive levels and most are not SM oils, but rather earlier SG, SH, or SJ rated. In a pinch, it should be fairly easy to find a motorcycle oil with any of these SG, SH, or SJ ratings at your local auto parts store when it may be more difficult to get Brad Penn or Swepco, without having it shipped to you. Please do remember that motorcycle oils typically have levels of Zn and P that will kill catalytic converters, so if you have one, either remove it first or use another oil, like Brad Penn or Swepco. Also, motorcycle oils are not as detergent as the aforementioned Brad Penn or Swepco, so you must change the oil much more often, even though the perception of being able to go longer because the oil costs more is a false one.

CPR

I use Jiffy peanut oil...as it smells very good @ high rev

ehall

And it really makes raspberry preserves smell mush better at high temps!


Back to some tech


I do not run a catalytic converter. What pk said above, is of legit importance.

boston951

pk & ehall, it just makes the cat delete option even more appealing