High-zinc oil or ZDDP oil additives?
Yep the VR1 has worked great for me going on 30 years.
I don't doubt Torco is good, I use the 85w140 RGO in my 8.75"
But $22 for a quart of oil better have some well proven independent lab testing that is repeatable.
If you look around there are independent tests that are public information. Some of what I tested was my own. I paid for it.
Many other times, a customer paid for it, so I do not release the results of what other people pay for. As I said, it is very very expensive to correctly test oil. It's time consuming. It takes a minimum of 27 dyno pulls to test just two oils. And that's IF you don't get bad information. I have seen many oils (Torco, Synergyn and LAT come to mind) that when tested make the reference oil look better for the first 3-4 pulls. That is because no matter what you do, you never get all the oil out after each test. Let's say you are using WalMart brand oil as the reference oil. That is the "A" test oil. You make 3 pulls and average the pulls. You make 3 more pulls to average again and compare the results. The I personally do 3 more because I have found that cheep oils fall out of grade and you can actually find a slight increase in HP if the oil was too heavy, or, you can lose HP if the oil was on the light side and now, under heat and load it loses power. After that, you drain the oil, change the filter and add the "B" oil. Now you do the testing sequence all over and see what the results are. Once you are done, you MUST go back to the reference oil (the A oil) and do 9 more pulls. Chances are, if you are testing a quality oil, you will see the "A" oil pick up HP for 3-4 or even 5 pulls, due to residual "B" oil remaining in the system.
As you can see, it gets expensive quick, and valid results are hard to get. But, there are real performance gains to be had.
I would say that accurately testing oils and fuel are the hardest and most complicated testing there is. That and exhaust systems.
