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I would just like to add that I've used Royal purple 10-40w in my boxster before and it ran great and I've used it on my other vehicles and after about the 2nd-5th oil change I would notice the engines would run alot smoother...
I remember pulling off my valve covers in my old Mustang to adjust the valves seen the rocker arms and metal body of the head were dark brown... as if the years of use had left a brown/blackish stain on the internal engine parts. Months later and 2 oil changes later using Royal Purple, I had to replace the valve cover gasket and i noticed all the internal engine parts under that same valve cover (even the underside of the valve cover) were CLEANNNNNN, no more brown burnt oil and fuel stain was found on the engine.
I mean it looked like a low mileage engine on the inside of the engine on the surface. So I give it my thumbs up especially now that they have 0-40w which is the recommended oil weight.
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