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Originally Posted by stateofidleness
Do I need to worry about doing a "Flush" and all that jazz if I switch to a different brand of oil tomorrow?
I've heard good things about the Castrol stuff, so I may go with that.
I'm still a little confused on what "cold" viscosity I need. 0w40, 5w40 or 10w40?
It's hot here, and only gonna get hotter. Does that equal 10w40?
Thanks guys. I'm actually semi-excited to think that it might quiet the lifters a bit.
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my suggestion, if i were in your shoes:
i would just do a regular oil change - drain the old stuff and put in mobil 1. replace the filter. change to good stuff by 3k or so, depending on how often you drive it. the little bit that would still be in the engine should be okay, if you're doing daily driving. if you're doing track days / ax / HPDE then i would be a lot more thorough and change a lot sooner. it's not like you're going to leave 5 quarts in there.
i would not go with RP, just my opinion. i used RP and found no reason to like it over anything else but it's your $. i didn't notice any ill-effects so it's probably okay. i think some people on the forum don't like RP because they do not have the same certifications that other oils have - (please no new oil wars). i ran it for 6k miles (7 mo). a few people have stuck with mobil 1 and when i do a short fill that's what i use.
but as you've found - never xw-30. i run 10w-40 and drive in the summers. while we don't get to 100+ very often, we do on occasion. i have driven to TX a few times in the summer on 10w-40, done the dragon on 10w-40, ran in porsche-palooza on 10w-40...