Hello, I am interested in some good synthetic oil for my freshly rebuilt stroker 1400cc VW Beetle motor. I am going to be running it a tad lean so the heat will be there. I believe it is a flat tappet system, although the lifters (I am running hydraulic) don't seem to be completely flat. I am running a custom short duration high lift cam and forged connecting rods, but I am not building this motor for power, rather for gas mileage. I am honestly not thrilled with conventional oil due to the temperatures happening in even a normally operating aircooled engine. I am leaning towards Royal Purple based on my friends' experiences with it. Any advice is appreciated.