I DO NOT agree that a heavier oil causes coking any more then a lighter wt oil would in most cases coking is cause by not changing the oil , running the oil hot and other causes a 50wt oil at 200 deg isnt going to stay on a part any longer then a 20wt oil will
"Heavier weight oils with low pressure pumps won't blow a head gasket but could plug by cooking off a piston cooling jet though for example. "
Does this mean a heavy wt oil with a high psi pump would causea a head gasket to blow ? and even if a jet was to stop up you wouldnt loose an engine , if that was the case then every Zetec engine out there and every 350 , 302 chevy and ford would be blowing up
I also feel a "stock" engine with modding and running it harder then built to do needs a higher wt oil for better protection
Im not trying bust your ba$$s just there is so many "opinions" that it leads people to believe things that are not true
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