Which oil do you use

[Sgreg]

All the test data can be found on Amsoils web site. www.amsoil.com. I personally called Amsoil and talked with an engineer on staff there who went over the data with me aand assured me the zinc content has not changed in recent times. All the comparison tests are on their site. Outperforms in every category. We owners don't use it mostly due to cost and availability; it is expensive but it is easy to set up a preferred customer account and get 20-30% discounts off of the retail price their products. Supply is housed in warehouses around the country. I ordered a case of quarts online and got it in two days delivered to my door. Corey Henderson introduced me to it.