Quote:
Originally Posted by megalapagas
I hate to be the one to start another oil thread but I've read several and they all seem to lead to Oil disputes (Blah!) I've read also that 0w40 gives very good feedback on the uao and its what they use to refill Gtr as of what I've read here and from the bottle itself. My question is perfomance difference since I've used 10w30 and my oil temps on 80 degree weather (mornings) goes just up to about 180and during afternoon its about 200-210 if I spirit drive highest tops it goes 220 due to my 34R cooler. Also how many qts of 0w40 do I put since I got the 34R? When I installed it(previous oil change prior to this one) I put the OEM amount which was 5qts and 1/4.
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Since you live in TX, I would go 5-10 as first choice, than 0-40 & 10-30 as last. I would never use 10-30 in colder states or winter because Z's are new modern cars & starting them with heavy "10"-30 oil is not the best idea.