My Imp specs 0w-20 oil (it says conventional is OK but there is no conv 0w-20 I believe), I've always just run whatever good quality 0w-20 is available every 5000 miles. Don't have time or money to do UOA so I figured in warranty might as well do 5000 (max allowed 7500 during powertrain warranty) to keep in line better with the other services that I can't perform myself. I've recently been thinking about things like 5w-20 and maybe even 5w-30.
Reason is, I've read that marketing and lawyers probably have more of a say in what oil to run than engineers do most of the time. Also that 0w-20 seems to be pushed in cars touted as fuel efficient to try to squeeze out every last drop of mpg they can get.
Once I get out of the powertrain warranty, how likekly/unlikely is it to cause problems if I run 5w-20 instead? 5w-30 might be a little thick I think, unless I happen to live in death valley.
Reason is, I've read that marketing and lawyers probably have more of a say in what oil to run than engineers do most of the time. Also that 0w-20 seems to be pushed in cars touted as fuel efficient to try to squeeze out every last drop of mpg they can get.
Once I get out of the powertrain warranty, how likekly/unlikely is it to cause problems if I run 5w-20 instead? 5w-30 might be a little thick I think, unless I happen to live in death valley.
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