: 2010 2.8 turbo-- gas



antdre20
04-08-13, 12:14 PM
Can I use regular gas in this SUV? Or should I stay with super? Please list some reasons why and not thx.

RippyPartsDept
04-08-13, 12:24 PM
straight from the owner's manual


If the vehicle has the 2.8L V6 engine (VIN Code 4), use premium unleaded gasoline with a posted octane rating of 91 or higher. For best performance, use premium unleaded gasoline with a posted octane rating of 93. In an emergency, you can use regular unleaded gasoline with an octane rating of 87 or higher. If 87 octane fuel is used, do not perform any aggressive driving maneuvers such as wide open throttle applications. You might also hear audible spark knock during acceleration. Refill the tank with premium fuel as soon as possible to avoid damaging the engine. If heavy knocking is heard when using gasoline rated at 91octane or higher, the engine needs service.

Huey Driver
04-08-13, 12:34 PM
Need premium (as Rippy said) with the higher compression of the turbo. If you dont, you'll have detonation which can cause motor damage. The octane rating has nothing to do with anything other than resisting detonation/knocking. However any higher compression motor will generally have detonation problems without it. Its not so much for performance as it is to stop the knock. Yes, the knock will reduce performance, but its the damage to the motor you would be more concerned with.

Most everything out there says "use only recommended gasoline grades". Higher octane doesnt really increase power (a gallon of gas has the same energy, no matter octane) so if the book says regular, use regular; if it says premium, use premium.

Kinda rambling, but hopefully you get the point. Just trying to explain 'why'.

RippyPartsDept
04-08-13, 12:48 PM
Here's a pretty good explanation of octane and how it relates to compression ratio

http://auto.howstuffworks.com/fuel-efficiency/fuel-consumption/question90.htm

the short version is that if you use 87 it will spontaneously combust due to compression instead of combusting by spark
the exact timing of the combustion events is crucial to operating correctly and the premature combustion causes knock
severe knock can cause serious engine damage

Turbo Dude
04-08-13, 05:41 PM
This tells it all....

http://blog.cargurus.com/2010/03/25/one-dead-2010-cadillac-srx-inspires-change-at-gm

zinner
04-17-13, 11:29 PM
Auto journalists blew up a 2.8t SRX by running it with 87. I know GM likes to say it's ok to run 87 with reduced performance, wouldn't catch me trying that to save a few bux.

Turbo Dude
04-18-13, 09:31 AM
After many years of drag racing turbo funnybikes, I have seen what detonation can produce. A very hurt wallet. I'll spent the extra $3.00 filling up and get on with it.

Huey Driver
04-18-13, 11:49 AM
I agree with both Turbo and zinner.
What I sometimes THINK tho is that the knock sensors 'should' fix most detonation situations, retarding the timing some to cut down on it... Perhaps my understanding of the system is over-simplified (or wrong) but I always kinda thought that one might be able to coax the computer to more power with high octane, assuming the computer 'should' just keep advancing the timing until it heard a knock...
Like I said, in theory, that might work. Reality is surely something different... :suspect:

Likely
04-18-13, 05:14 PM
Throw in Premium!!!!!Keep your engine performance up.....

SRX CADDI
04-20-13, 08:13 AM
how about middle grade fuel...gas is expensive here in Canada

Marc NY
04-20-13, 09:51 AM
how about middle grade fuel...gas is expensive here in CanadaYou can use regular or middle grade gas for the short term and your computer will adjust the engine's timing and performance automatically. However, you will notice there will be some loss of HP and your gas mileage will also be affected too. I see hundreds of Canadians come to the US for shopping savings and gas savings. They fill up as many as 3 and 4 Five gal. gas cans all the time to take back with them.

IMO I would try not to use mid grade or regular gass for more than a couple of tanks full.

SRX CADDI
04-22-13, 08:09 PM
ok thanks...people like that have a lot of time to come there and fill up gas cans...let me guess they are all driving 4 bangers...lol

Marc NY
04-23-13, 09:12 PM
ok thanks...people like that have a lot of time to come there and fill up gas cans...let me guess they are all driving 4 bangers...lolActually, I see a lot of big truck and van owners filling up their gas tanks and gas cans too ... LOL Hey come on down and visit the good ole US of A and save $$$ :patriot:

BTW: If you know anyone up in the great North who might like a great deal on a slightly used and beautiful 2013 SRX this summer just let me know. :D