what type of fuel?

[mrplease]

what type of fuel do you guys put in your car? and do you have to put the high octane gas? just curiuos.

i bought my car this may and since i've had it i always put in the highest grade fuel. and the lady i bought it from says she always did to.

i have no plans to ever put anything other than the highest octane fuel, i'm just wondering if you can put regular gas in, and if anyone here does...

[2004CTS]

I put 87 octane in my 2004 3.6L and it runs great (see owner's manual). Higher octane was "recommended" for the 3.2L. The 3.6L engine can benefit from higher octane fuel and will provide "peak" performance when its used.

[propninja]

I use Premium in my 3.2 although I've used mid grade with no problem.

[RobertCTS]

87 is recommended. High octance only adds anti-knock additives for higher compression engines. So you're wasting your $$

[urbanski]

i tend to use gas, seems to work ok

[louiefl99]

I believe the general consensus is to use a quality gas at the lowest octane that keeps your engine from knocking. Available everywhere, check out www.toptiergas.com for more insight. I've driven my 3.6L CTS for almost 50K miles and I've used only 87 octane (mostly from top tier sources) without any performance or engine problems.

Try running a few tanks of 87 and see if you notice any differences. Mid grade is cheaper then premium, you might try that as well.

[CADIMAC52]

Originally Posted by urbanski

i tend to use gas, seems to work ok

Now theres a concept

[mrplease]

thats cool, thanks for the input guys.

i don't drive my CTS to much. maybe 2-3 times a week, more for recreational stuff anyway. i mostly drive the wifes aviator. if i put a lot of miles on the CTS i might consider using the cheaper gas, but if i'm only putting 100 miles a week on it so i'm not to concerened about the gas prices.

[ILLMATIK]

I use 87 most of the time. When its really hot i tend to put in the premium stuff though.

[caddy1219]

I always use Premium in my 3.6L because when I used 87 in my car it felt like it was stuttering on the take off and it never does it with premium.

[mocts]

87 and it runs fine. my parents would kill me if they found out that i put in premium. if i did i would have to start paying for gas, which i most happily pass on

[Caddylenz]

Hi, new member, first time on. Interesting I was actually going to ask this question earlier as I really seem to notice a difference when I fuel up with 91 or higher. There is the occasional place up here where we can buy 93. Good for the CTS and almost good enough for the F-18.

[RobertCTS]

Originally Posted by caddy1219

I always use Premium in my 3.6L because when I used 87 in my car it felt like it was stuttering on the take off and it never does it with premium.

That's not normal. Have you SR look at it. Anything over 87 octane on a 3.6VVT is wasting your money.

I encountered some high RPM miss. A set of Denso Iridium Spark plugs fixed it. Not an easy DYI!

[caddy1219]

I guess my car acts a little different because with 87 I miss and it stutters on take off, but when I am running 91 it runs like a champ thats why I have stuck with 91 I have tried to go back down to 87 a few times and it will go back to stuttering so I feel I have to stay with 91

[tonytun]

o0 shit am i wasting my money then? :-( i use 93 on my car--- i have a 2.8 cts 2007 but i did notice dat when i was using 87 the gas wouldnt last long so i started using 93 and saw a difference and another thing remember guys i live in miami and is hot as hell here everyday. what do you guys think??? should i go back to 87? and if i do would dat affect my car bcuz i was using 93?