So after seeing all the posts about oils and a comment on each one at least saying how an oil pressure gauge is one of the only ways to tell if your oil is a good viscosity for your engine. I can guess it would be a way to tell if oil is getting thicker or thinner. My next gauge is a oil temp gauge but i wont have it in for a bit. So I installed it and that was a really easy task. My truck Is all american so the fittings are 3/8 npt in the block so i just got a few fittings like a tee and a bushing. I slapped it in and mounted everything. When I started it up it read 47 psi and i drove it there about 2.5 hours prior. It eventually went down to 22.5 psi warm at idle, and would climb to 50psi when i revved it up. it only was about 2500 rpm when the bypass kicked in at 50 psi. Also my engine has no blowby when the pcv valve is pulled and there is no leaks. So I guess everything with the oiling system is mint. With that being said and the fact of any oil being too thick at start up can I run a 0W-xx and not have to worry? Would that be better than the 5W-30 im running right now. If i got bad oil pressure with the 0w i would change it out and not run it, but do you guys think i should try it next oil change?? My next change should be in the summer so i would not get the cold start bennefit in the winter. And i have a oil pan heater and a 400W block heater and leave them plugged in all the time so my engine has at least 100 degree water and warm to the touch oil. Thanks everyone and hope the fellow canadians are having a good thanksgiving. Ps I will be doing a 5000km UOA with my current fill and will do one with the next change to determine when to drain cause i want to do extended OCI's.