2009 Pontiac G8 Cammed

[Bulli]

My Girlfriend has a 2009 Pontiac G8 ~ 140k miles
Factory calls for 5w-30 but she told me her mechanic has been putting in 5w-40.
It is hard to get 5w-40 in stores and i was wondering what oil weight would be closest to 5w-40 that i can buy in bulk and change her oil

Im assuming he drifted away from 5w-30 because the car is cammed and high milage.

so what would be more similar to 5w-40? Would it be 0w-40 or 10w-30 WE live in Midwest.
Winters can get to -32 F and summers around 100 F

 

[Bandito440]

Gallons of 5w-40 can be purchased at every Walmart, Auto Zone, Advance Auto, NAPA, and truck stop.

Look for Rotella T6.

 

[sciphi]

0w-40 would likely be closer.

 

[SatinSilver]

Originally Posted By: Bulli
My Girlfriend has a 2009 Pontiac G8 ~ 140k miles


Hey there, any pictures to share?

 

[BrocLuno]

Yup, Rotella T6 is the go-to easy to get 5W-40, and at that mileage is very appropriate

 

[gonefishing]

Mobil 1 0W-40 get's my vote. Walmart carries it usually for around $25 per 5 quart jug.

 

[Rolla07]

0w40 or 5w40 will work equally fine. Nice ride!

 

[Danno]

Originally Posted By: SatinSilver
Originally Posted By: Bulli
My Girlfriend has a 2009 Pontiac G8 ~ 140k miles


Hey there, any pictures to share?


GF or the car?

j/k

 

[Bulli]

It Is cammed and has a cat back exhaust and dyno tuned
Not sure about numbers but
~ 350- 400 whp sounds accurate to me

 

[jayg]

Interesting why the mechanic has been putting in 40w to being with. Doesnt hurt anything but definitely isn't required just because it has a cam on a modern LS.

Does it burn or leak oil? If so, I'd run a 5w30 HM full synth. If it doesn;t, try any 0w40.

 

[Bulli]

yes it burns oil
seems like a quart or 2 every 3-4 k miles

 

[daves87rs]

That sounds like a decent amount of oil there...

 

[bvance554]

Originally Posted By: sciphi
0w-40 would likely be closer.


Closer to what?

 

[Olas]

Is your girfriend the driver in the picture? She must have a really good personality..

 

[RationalRussian]

When modifying internals with high lift cam lobes its not a bad idea to add a little extra protection. I would personally run 0-40 M1 over T6 but thats just my option. Always ran it in my LS6 swapped FD RX7 with positive analysis's. No need for anything crazy like 20-50, but a good 40 weight is all good in my book.

 

[SirTanon]

Amazon has Gallon jugs of Rotella T6 5w40 for $26.30 right now. If you do Subscribe & Save, then they're only $22.36 each.

Or you could hit up Home Depot. The one near me has some on the shelf for $21.36 a gallon.

Finally, Walmart.com has 2.5 gallon jugs listed for $53.18. This works out to $21.27 a gallon.

 

[jayg]

Originally Posted By: RationalRussian
When modifying internals with high lift cam lobes its not a bad idea to add a little extra protection. I would personally run 0-40 M1 over T6 but thats just my option. Always ran it in my LS6 swapped FD RX7 with positive analysis's. No need for anything crazy like 20-50, but a good 40 weight is all good in my book.


A high mileage 5w30 full synthetic HM oil should meet the requirement of the OP's climate and give a little help with the consumption hopefully. On any high strung engine that I have run, I've never increased viscosity because of a cam profile, the only reason i've done it is because of boost and heat management. Might help/ couldnt hurt however if you still want a high mileage oil to try and slow the burning, 5w30 is about as low as you can go for your application and if you want a 40 wt, youre stuck with full synth 10w40s.

High mileage 5w40s are hard to come by and only euro Maxlife come to mind if you want a 5w for winter and 40wt operating temp and high mileage additives. Then you still end up with a blend.

 

[Shannow]

Originally Posted By: jayg
A high mileage 5w30 full synthetic HM oil should meet the requirement of the OP's climate and give a little help with the consumption hopefully. On any high strung engine that I have run, I've never increased viscosity because of a cam profile, the only reason i've done it is because of boost and heat management.


Pretty much agree there.

A cam (typically) takes away (some) low end torque, and therefore bearing load, and moves it up the curve, where revs are your friend with regard to oil film thickness.

 

[A_Harman]

M1 5w30 High Mileage. That engine doesn't need 40-weight if it is only being run on the street.

 

[artificialist]

Originally Posted By: Bulli
yes it burns oil
seems like a quart or 2 every 3-4 k miles

Do you know if this engine uses a PCV valve or a fixed orifice?

If it has a PCV valve, replace the PCV valve and hoses with new OEM parts. This should lower oil consumption. I have also heard that GM made new valve covers for LS based engines which either reduce oil loss through the PCV valve, or they replace the PCV valve with a fixed orifice. You may need to go to forums that specialize in LS based engines to know more about this.