The biggest problem with reliability is design and the manufacturers' attitude on what to build. I wouldn't trust a company from Britain building exotic sport car to make reliable engine that last 300k miles running 10w30. I am ok with a boring appliance car company in Japan doing so using 0w8 engine oil if they historically can do that using 0w16 or 0w20.
Engine wear due to thin oil? If they design it right with the right flow they should be ok. If they use plastic on steel chain and didn't heat treat the parts correctly to save $5 here and $2 there then you are doomed regardless of 0w20 or 0w8.
If you mod your car with aftermarket turbo you shouldn't use what the OEM said anyways, you should follow instruction from the guy selling you the turbo and installing it for you.
Engine wear due to thin oil? If they design it right with the right flow they should be ok. If they use plastic on steel chain and didn't heat treat the parts correctly to save $5 here and $2 there then you are doomed regardless of 0w20 or 0w8.
If you mod your car with aftermarket turbo you shouldn't use what the OEM said anyways, you should follow instruction from the guy selling you the turbo and installing it for you.