premium fuel on sxt???

[proxyx99]

I think I finally got some closure yesterday. There was a short discussion in AutoTalk (local car troubleshooting TV programme) about fuel grades. Three automotive experts agreed that if it (manual etc.) says "premium fuel ONLY (!)" use higher grade, 89 or even higher depending on instructions. If on the other hand manuf. states 87 or 89, IT MEANS 87. That was their interpretation. They said "it simply means 87" (if you insist 89). For all practical reasons you can safely use lower grade. How much happier Magnum 3.5L would be on 89 no one knows... couldn't find it anywhere. Sticking to 87. Period.

[Vinniej]

The manual (at least on the 2005 models) says 87 for the 2.7L and 89 for anything else.

It is page 250 in chrysler 300 manual, but I know it is in the magnum manual from when I had mine.

It is in the "Starting and Operating" section under "Fuel Requirements". The requirements part makes me think that it is not really an option. Also in that part it talks about the possability that low grade fuel can cause spark knock, and that it can cause engine damage.

Like I said though, this is coming from the 2005 Magnum & 300 manuals. the requirements may be different for following years, but I seriously doubt it.

[brianjax]

ok thats it you guys talked me into it im tryin out 89 for a little and see what i think!

[BigH203]

I stick with mid-grade (89). Whenever I put 87 in my tank it goes like water, and I used to be one of those guys who thought gas was gas no matter the octane, but having the Mag has changed my opinion. If I go higher with the octane like to 91 or 93 I notice it lasts a bit longer as well.

[QuickSilver08]

Well, I know we don't do a lot of stuff the factory way, but don't we all listen to the owners manual for oil, AF, transmission fluid, spark plugs etc? I use 89 in both of them. I saw no improvement when using 93 but I have seen a reduction in mpg w/87. One other thing I will say is that I avoid places that only have one hose per pump. 3 fuel types, 3 hoses...that's the only way to go.

-Floyd

[cksteele79]

well as i have said before the higher the octane means nothing in terms of performance or extra MPG all the octane rating denotes is the ability of the gas to withstand higher compression ratios without detonating early that's it period! anyone who says that it gives them better MPG or more horse power is DEAD wrong! its all in perception not real facts all gas 87-89-91 all have the same potential energy in them. if the owners manual says 87 there is no point in wasting money on 89 or 91 it wont make your car run cleaner or better now if you put 87 in a Lamborghini for an extend period of time then that can possibly foul the engine more. but not for the sxt magnum the manual says you can use 89 and also 87 but it doesn't recommend it i have an rt and i use 89 because that's what the owners manual says the engine has been designed for due to the higher compression ratios in the hemi but the computers in todays cars eazly compensate for 87 gas so either way it does not matter you could use bolth but better HP and MPG with 91 over 87 is just a myth