Seems like a game changer to me.

I'd like to see someone using it with an oil analysis. But it sure sounds nice.

I also use the Valvoline VR1 line, and they have a 20W-50 viscosity if you choose, too. I can't speak to using synthetic in a recent rebuild, but I tried synthetic in two of my older cars years back and neither liked it much. Same viscosity as dino oil, but both vehicles started burning oil with the Castrol Syntech I used, so I suspended use. Other folks may have different experiences, but I'll stick with with VR1.

Jeff

I use 10-30 Mobil 1 in all roller and hyd roller cam cars as it comes out of the bottle.No additives.Tom

I've used Valvoline VR1 and Lucas Hot Rod & Classic oil. No complaints with either.

Just bought 5 Quarts of the Castrol GTX Classic at a local Walmart for $6.28 a qrt. sold in Quarts only. Thought I give it a try when changing the oil in the fall. I have been using VR1 for a number of years.

I like Valvoline VR1 10w30 Conventional oil with a Bosch oil filter. Would like to try Quaker State 5W-30 full synthetic oil. From what i am told, this oil is the best on the market from an engineer who tests motor oils. But full synthetic oils have be known to cause oil leaks on older engines and sometimes tappet ticking when starting up engine after sitting and then stop after lifters pump up.