I have an Audi s6 with a v10(Lamborghini) and being a early version of or one of the first 5.2l engines it has issues. Carbon buildup, oil burn off and a probability to leak onto the exhaust. I wanted to continue to use VW certified oil. Upon research I narrowed down 3 oils that were either the best in wear protection and maintaining the engine or we’re an amazing cleaner. Royal purple burns off way to fast for the engine and isn’t VW compliant. Mobil one and AMSOIL were the other two with AMSOIL being the better of the two but harder to get. I first used Mobil one and after 5k miles the 11 quarts of oil were burnt up and had lost most of its lubricating properties so I immediately changed it out with AMSOIL. Right away there was a noticeable difference. The engine was quieter and smoother. Power gains if any aren’t really enough to feel. After 1k miles on AMSOIL the oil hasn’t burned off at all and is the same color and consistency as it was out of the bottle. I’m hoping that it lasts the life of the filter ( wix 10k miles). I know they guarantee 25k or a year so if the oil is still good at 10k I’ll just change the filter. However, overall it is cheaper to use AMSOIL given it holds up to 20k miles. Even if it only lasts 10k it is still cheaper than 5k oil changes with Mobil one.