Jeep Wrangler Forum banner

What octane to runs best with new 2012 3.6L? 87,89,93?

42K views 102 replies 57 participants last post by  Hammertime 
#1 ·
Just curious which gas runs smoothest on the 2012 model 87,89 or 93? I know every engine stock tunning is optimized for a certain fuel.

Still some newbie questions left :).
 
#4 ·
Also Synthetic oil isn't going to do anything. So save that money up for more mods down the road. :wavey:
Synthetic oil has been shown to free a handful of hp at the rear wheels in many applications. I personally noticed an average of 1+ mpg better fuel economy when I did the switch.

Take a quart of synthetic and a quart of dyno oil and let them sit outside on a day when it's below zero. Then, try pouring both. The conventional oil will pour like honey, the synthetic will be unaffected.

Yes it does have its merit.
 
#5 ·
jk wrangler fan said:
Synthetic oil has been shown to free a handful of hp at the rear wheels in many applications. I personally noticed an average of 1+ mpg better fuel economy when I did the switch.

Take a quart of synthetic and a quart of dyno oil and let them sit outside on a day when it's below zero. Then, try pouring both. The conventional oil will pour like honey, the synthetic will be unaffected.

Yes it does have its merit.

Ok I guess I am wrong it will do something but to me it's not worth the extra money. But hey I live in central NY we are only below zero five or six weeks a year.
 
#14 ·
Ok 87 then:). Just wanted to ask since going near below freezing weather the higher octane sometime idle and runs smoother on some engines. It all depends on how the computer is tuned and optimized.

In the old days a timing gun and turning the disturbutor really adds hp on high octane and today it's all about the computer tune. Thanks for everyone's help.
 
#21 ·
I was given 87 when i bought the jeep and i thought it ran a little rough. I had a 11 toyota tacoma that i ran 94 the one time i tried 87 it to ran like crap. I switched to 94 and it runs sooooo much better!!! Im broke as hell and should not have a 12 wrangler lol but its my dream car and I sh*t you not it runs better on 94! I will try 87 for 2 weeks and i will check back in but im not crazy!
 
#25 ·
chim-chim7 said:
87 octane makes more horsepower than 91,93, or any number higher than 87. Not the other way around.
I never claimed horsepower gains, merely less ping and better giddy up. Open for interpretation. Interesting statement though, I was not aware 87 octane made hp. I assumed higher octane was better when looking to race tune your motor with add ons etc..
 
#26 · (Edited)
Yep, higher octane is only needed in high compression applications. It will make less HP, but it will burn cooler and slower lowering the chances of pre-ignition and engine damage. I used to laugh when guys would show up to the track in stock Mustangs and Camaros who claimed to put VP 110+ in their tanks for ripping horsepower. Little did they know their trap times were slower, not only that but they were adding plenty of carbon deposits to their piston domes and valves.

If someone is looking for good clean fuel for their Jk it should be Techron 87.
 
#52 ·
what should i do when it pings in first??

i too have experienced positive results with higher octane gasoline. scream at me all you want. "you're wasting money!" "you're not experiencing any performance benefits!" "you're causing harmful deposits!" [psst... i will continue to run 93o! nah nah nah nah nah]

i would put money on if i had the 3:73's or [numerically] higher gears, i wouldn't have been hearing the pinging near as much as i was. alas, i have 3:21's and a 6speed on factory 31's. haven't had pinging return while running 93o. not once.
 
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top