How Does the 15w50 mobil 1 compare to the 15w50 motul 300v? The Mobil 1 seems to be highly regarded on these boards, but is actually more expensive here than the 300v. I've narrowed my next change down to these two. Does anybody have specs on the 15w50 300v? Or better still a VOA. Thinner oils are extremely uncommon in Europe, and are thought to be too thin for my 70's developed turbocharged pushrod engine. Various sources have recomended semi-synth only for my application. I believe this stateme nt to be complete toss in a turbo charged engine...It may be an old design, but why can't it benefit from modern day technology?