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I was talking to the guys working on my car today and they told me that i should not but premium gas in the cts! Put 89 octane in it and the rumbles and such from the engine should go away......did other people know this?
Mine's very happy with mid-grade 89 octane. (12,000 miles)BUILDINGCTSAMG said:I was talking to the guys working on my car today and they told me that i should not but premium gas in the cts! Put 89 octane in it and the rumbles and such from the engine should go away......did other people know this?
I was under the impression that the 3.6 takes 87 and the 3.2 take a higher Octane.BUILDINGCTSAMG said:I was talking to the guys working on my car today and they told me that i should not but premium gas in the cts! Put 89 octane in it and the rumbles and such from the engine should go away......did other people know this?
Wow, so not only will I be saving in terms of gas consumption but also in fuel grade? I can handle that.miscreant said:The 3.2L is recommended 91octane. The 3.6L is recommended 87 octane.
My dad's old deville rattling was solved by using a lower octane.j-w said:Is it possible the higher octane would be causing engine noise/rattles/rumbles? That doesn't sound right. Usually it's just the opposite. Been using nothing but 93 octane in the 1600+ miles I've put on it so far.
My appologies. I was going way back to look at posts and didn't realize I would bring this post to popular viewing. Now I get how things work. You post and it moves it forward to the front of the line.tzoid said:this is an old thread that has had lots of info provided on grades of gas for the '04 CTS with the 3.6L engine, many by the General's factory technocrats . Long story short...designed for 87 octane, will not provide ANY additional hp from higher grades, can potentially do more harm than good due to detonation points of higher grades and last, but not least, a waste of money. You should be thrilled that the 3.6L was designed this way...prestigue no longer exists because it burns high test!
where? page#?silver bullet said:I agree that if a engine is designed for 87 octane there is no reason to put a higer octane in. But why does my 3.6 owners manual say for maximum performance use 91. It runs great on 87 but does feel stronger especally off the line with premium.
Because it's just a reprint/remnant from the 3.2L.silver bullet said:I agree that if a engine is designed for 87 octane there is no reason to put a higer octane in. But why does my 3.6 owners manual say for maximum performance use 91. It runs great on 87 but does feel stronger especally off the line with premium.
$3.25 a gallon worth it???? I can think of a couple things I could buy for a 3.2L in a couple months from the money not spent on that gas that would give better performance than 100 octane. That's not worth it and most likely going to kill the 3.2 prematurely. The ECM will most certainly adjust for some serious retard you're running with 100 octane. That's like running race gas every day. I'd hate to see inside your engine.rollinincaddys said:I Have A Cts 3.2 All I Ever Put In That Car Was Octane 100. Its Expensive Like 3.25 A Gallon But Its Worth It. The Car Get More Torque .