Re: Zddp question

Posted by Tim Cole On 2022/9/29 18:37:03

For your first question 3200 ppm are what is in racing oils and extreme use marine oils. If you are paying extra for it, you probably should use a different product.

As for modern SN/GF-5 oils versus old stuff I only can site that the oil sold specifically for my lawnmower is an SJ rated oil at 1100 ppm versus SN/GF-5 which something like 300. My lawnmower does not have a cylinder liner so I am not going dismiss what Briggs and Stratton is selling as a hoax.

One thing about zinc is it can act as a sacrificial barrier to corrosion, and I suspect modern clean burning engines don't need as much as dirty old carburetors.

I don't live near an engineering library anymore, but if I get curious maybe I will go down to the Flint library and order a petroleum engineering handbook to look at what they say. But they have to fix these broken down roads first. Until then I will stay here in small town.

Oh, and one more thing, it's all over the news they started tearing down the Packard plant today. It's labelled as an "embarrassment", but to whom?