Is 87 good enough?

[CarbonSteel]

Nah. The 2.0 is fine with 87.

Agreed; I put over 3,100 miles on a Sahara with a 2.0T running nothing but 85.5/87 octane in it at highways speeds of 75+ (fully loaded for a camping trip) + off-roading in WY/MT and never had any pinging or loss of power. I think one can run higher octane if desired, if towing, or if pinging happens, but I have not seen that higher octanes are "required".

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[JeepU4IA]

I have the 3.6 and really wanted to use the 87 to save money and because some people adamantly claim there is no benefit to higher octane fuel. I've switched back and forth between 87 and 91 and am now thoroughly convinced there is a definite difference in the way the engine performs and the amount of pinging, especially in summer temperatures. I'm never going to use 87 octane fuel again.

 

[Jason Oliver]

Everyone is correct.

That being said, my own experience (with 3.6 / manual 6 speed / 3.45 gears) is that 87 is "adequate - most of the time".

However, she runs smoother and with less pinging/knocking sounds using higher octane.

When I am going to drive the forest roads (where low rpm driving is unavoidable) I add a 1/2 tank or more of premium, and that is enough to cure the pinging/knocking for the day.


If money were no object, I would probably run at least mid-grade for normal driving. But I drive about 22,000 miles a year and money is an object, so I mostly use regular.

 

[1quick1]

You can run 85 here and have without issues in the past. I usually fill up at half a tank and just switch back and forth between 85 and 87. Probably not necessary and I'm sure 85 is perfectly fine but figured the extra octane won't hurt.

 

[Kluk Ztopolovky]

I run 87 oct. gas but I make sure to pump at Sheel or Esso[/QUOTE]

 

[Mack.]

I know the manual says 87 octane, but it’s says a lot of things. lol
Has anyone had better performance with a different octane? Mine seems to idle a little rough (No spikes in RPMs) with 87. It could be cheap gas, breaking in (only 250 miles so far), or just how the engine runs, having never owned one I have no baseline to compare it to other then my 4 cylinder car. Thanks.

They sound like they are about to blow up. Mine and my sons new 2025 JL 4 cylinder 2.0 sound horable when they start. Whet it starts the idle is about 1800 rpm for a few seconds. You will hear this story from everyone who has one.

 

[Islandlife]

Not sure how many people this applies to but I imported my 2018 JLU into the Netherlands and ran the minimum here which is 95 RON and it ran ok and switched it to 98 Ron just to see if it would help with a bit and it idles and engine performance is a lot better. I’m not educated very well in the mechanics of the upgraded 3.6 but my engine likes it so I’ll probably keep doing what it likes.

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