Freefallin

Title basically says it all.

P.s. Can be up to 108 F for a good portion of the year.

P.s.s. BTW....it's a question. Title was too long to add a question mark

Zmg00camaross

iTrader: (11)

A good quality 10w30.

JRENIGAR

iTrader: (37)

Thats what I used in my last T/A that had 230k on it when It was sold. Run great and made 450RWHP on 8lbs of boost for the last 50k of those miles and driven 110 miles a day.

mchicia1

iTrader: (5)

m1 0w-40 or m1 5w-30 high mileage formula. Both are thicker and have good additive packages.



m1 10w-30 is one of their worst oils. It's a super THIN 30 weight, exactly what you don't want in a hot climate.

http://www.mobil.com/USA-English/Lub..._1_10W-30.aspx

grimspyder

iTrader: (1)

Now, Ive have just started to educate my self in how oil works, But my understanding is that 5w-30 and 10w -30 both still have the same viscoisty at 210deg, and 5w will flow better at colder temps than 10w. So 5w will provide better start up protection than 10w.
From what i understand.

thunderstruck507

iTrader: (18)

I use ow-30 Castrol Syntec European Formula year round. We get from -2* up to 100s*.

Russ K

iTrader: (1)

At those temps, your oil temp will be >200*F. 15W50 or 20W50 performance oil, Joe Gibbs Rod Hod, VR1 Valvoline, Royal Purple HPS or Mobile 1 15W50.

Russ Kemp

mchicia1

iTrader: (5)

Sort of, but not all 30 weights are the same thickness. You have to look at the viscosity @ both 40 degree and 100 degree Celsius.

The lower the number, the less viscosity, the thinner it is. 10w-30 actually is just as thin as the 0w-30 mobil 1 when cold, which is why you can't just look at the two basic weights on the bottle.
Mobil 1 10w-30
Viscosity @ 100ºC, cSt (ASTM D445) 10.1

10.1 is very thin

Mobil 1 5w-30 high mileage
Viscosity @ 100ºC, cSt (ASTM D445) 11.7

Mobil 1 0w-40
Viscosity @ 100ºC, cSt (ASTM D445) 13.5

I'd personally run the 0w-40 in your case.

SNLPerformance

iTrader: (15)

I agree

Russ K

iTrader: (1)

Right out of the C7 Corvette owner's manual "For track events or competitive driving, use Mobil 1® 15W-50 engine oil"

Russ Kemp

96capricemgr

iTrader: (1)

As mchicia1 thank you for completely shooting down the "10w-30 is thicker than 5w-30" ignorance that invariably comes up in these discussions.

CarlostheBarbarian

+1. 0w-40 is probably the best all around oil Mobil 1 makes. Great oil. On par/if not better than a lot of the boutique stuff that costs double the price.

.boB

iTrader: (1)

Oil questions on all car boards are extremely common. I think that's because there's so many choices, so much advertising hype, and so little information from manufacturers.

www.bobistheoilguy.com is a great place to get real information. Be prepared to spend some time reading there, though. I find it fascinating information, and one thing leads to another.

Once there, this is the general information you'll find on viscosity:

5W: or whatever. Means what the oil will pour like when cold. IIRC, the standard test temp is 0*C. The colder the temps you might see, the lower that number should be. Seems like most manufacturers currently recommend 5W. No matter the environment, use the lowest number you can get with your favorite oil.

40: or whatever the upper number is. Indicates viscosity at 100*C. This number is actually a little misleading, though. a 5W-40 will not actually have a viscosity 40 at 100*C. True oil viscosity is measured at a much lower temp, like 45-50*C; I can't remember the exact ASE standard temp. a 40wt oil will pour like a 40wt oil would when heated to 100*C. So at 100*, your oil viscosity is significantly lower than 40.

Now, how much viscosity do you need? Keep the W number as low as possible. No real advantage to a higher number. 5W is best for all around use. The lower number will lubricate the engine faster at start up.

The upper number should be high enough to maintain proper oil pressure, and no more. High viscosity provides no additional protection or benefit. But it does take more energy to move around and puts more strain on oiling components. Some NASCAR teams are using a straight 0wt oil for qualifying. Not good enough for anything more than 4 laps, but does give them a little more power.

I have read a rumor that 40 will provide better lifter stabilization at high rpm's. but I have not been able to confirm that anywhere.

I race a 600+hp SBF in road racing classes. I use a 5W-30 with excellent results. After two years of racing and street driving, there's almost no bearing wear.

I also found this information to be quite interesting. http://speedtalk.com/forum/viewtopic.php?f=1&t=35836

A note on synthetics. a true synthetic oil is just that - synthetic. It starts with a man made PAO base stock. That provides better stabilization in the long run, and at higher temps. AFAIK, there are only 4 oils on the market that actually use a PAO base stock, and Mobile 1 is not one of them. Everything else starts with hydrocracked dead dino's. That doesn't make M1 a bad oil, just not a good value.

Let the UOA be your guide.