What would you guys say is the best motor oil for a turbo 420A during winter? It gets pretty cold in Illinois and I'd like my car to start. Last year I think I used 10W30 but I always have those stupid RPM bobbles when the car first started up. Wondered if maybe a thinner oil would be better for that but I didn't want to get too thin of an oil because of the turbo.

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HAD: '98 Eclipse RS

HAVE: '04 Grand Prix GTP Comp G

I've been using 10w30 too, I'm in WI. It's been working fine for me.

1999 Black w/black leather GS 10th Anniversary OZ edition
5 speed
Modz:
HRC Stage 2+ 16G turbo
Viper 650.2 components
Image Dynamics IDQ12 sub
Avionixx 600.4 amp

Well the RPM bobbles are not because of the oil, that's all because of the cars ECU. On cold startup days there is supposed to be a high idle. Sometimes it bobbles, but this is all a function of the sensors and circuts not the oil.

I edited to the wiki!