I was just starting to wonder about using Amsoil vs Valvoline now that VRP is starting to show up in ON, Canada. I can get Amsoil SS shipped for the same price (slightly cheaper) as VRP w no shipping. If I were to go with either one I'd have to get analysis done to benefit from the 3x cost of the oil vs Walmart or Costco.
In my case, all the engines are all over 10yrs old (high mileage) but none of them really burn / leak anything significant. Should I entertain:
1. Amsoil HM, Euro, SS + testing
2. Valvoline Restore & Protect + testing
3. Stick with Walmart HM / Costco, no testing, 5k OCI
The cheapest is Costco 5w30 on sale, but no HM option.