We use Castrol Edge 10 - 60 SYN in our blown alcohol 510 cubic inch circuit race boat. Have only used this oil since converting to the supercharged engine that develops around 1500 hp at 7200rpm (1115 kw). In the past 3 years on annual maintenance engine tear downs there have been no marks or wear on any rotating components, piston/bores or valve train components. I highly recommend this product if you want your engines to have the best protection. It isn't the cheapest on the market but competitive if you want the best. Try to buy up when the product goes on sale at your parts store outlets.

I obtained my vehicle with the former owner recommending this oil in a 10W60 viscosity. It also had a substantial valvetrain noise that wasn't remedied by adjusting the valves. Imagine my surprise when a competing product in the same grade that was $20 cheaper silenced the rattle, and has continued to this day.

I have a friend who swears by this oil but I feel it's more marketing than anything. I honestly can't warrant paying a premium price for what is essentially just another full synthetic. Plenty of other products out there that will give a similar result for less money, or a better result for the same money.