so i told the wife to pick me up some oil for a change and i told her 5w30 well she got 10w30. i have an 07 base. will the 10w30 be ok? thanks in advance

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07 Grand Prix 4 dr base model

These newer engines are fairly sensitive to oil viscosity/oil wieghts. I'm not 100%, but I think using 10W30 may set an engine light on the newer gen 3800's.

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Fast.Loud.Shiny

I run 10W30 in the summer time because of the warmer temps and I do not get any CEL's because of it.

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2009.5 SBM G8 GT
November 2011 Car of the Month

I say stick to 5 weight just in case

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2006 Subaru Impreza WRX STi My Build Thread
2004 Grand Prix GT2 : September 2011 GPONA COTM : SOLD
1997 Grand Prix GT1 : SOLD

L67/ L36 SII motors run 10W30 and there is hardly a difference between those and the SIII motors so you will be fine with 10W30.

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2009.5 SBM G8 GT
November 2011 Car of the Month

As mentioned Series II's all run 10w. Since you're in Ohio I'd personally stick with 5w if you intend on driving the car deep into the winter months though but it's really not that big of an issue. These aren't little fragile motors that will break stuff if you put slightly heavier oil in the crankcase.

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Dubs:00 VW GTI VR6, Low and Slow 91 VW GTI 8v, Shave the Bay!! 91 VW Cabriolet 8v, bitch Basket
GP's:04 GP GT, Past now G-Ma's Girlfriend's 97 GP GT, "Project Pink Power"

Boy 10w40 never seems to hurt mine, but it is synthetic and not driven in the winter..

I run 10w30 in the other car that does go through winter never had problems yet.

I usually go up a weight from recomended just because I tend to drive a little harder and like to have the little extra viscosity when it gets good and hot. , besides unless your going from like 5w30 to 10w40 or 20w50 the changes are minimal.

sent from my driod x, via my fingers through tapatalk

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2001 white gt coupe with enough crap to make it run mid 13's with 3 bad pistons
2002 40th GTP sedan mostly stock

No, the 10W30 will not, I repeat not hurt any of the 3800s'. I work for the corporation the makes the additive packages for nearly all oil companies world wide, this includes pass car, heavy duty diesel, two cycle etc... The 5W30 oil for these cars has to do with fuel economy so GMs' fleet can meet the fleet requirements for fuel economy. So they recommend 5W30 for the car because that's what it was tested with for the cafe test & it gives better fuel economy than a 10W30 or say 10W40. The fact is, that in these traditional engines with standard tecnology, a 10W30 or 40 will protect the engine better from wear and frictional loads than a 5W30. If you were running the newer type engine with duel over head cams and VVT that would be different. These have small oil passages for the regulation of those devises, so a 5W30 is important for those types of motors, but not the 3800.