JL 4.0 Turbo gas Choice Question - JeepForum.com
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post #1 of 4 Old Yesterday, 11:32 AM Thread Starter
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JL 4.0 Turbo gas Choice Question

I see some thread that mention 91 octane is recommended for the 4.0T ...where is that in Jeep manual or literature? My manuals says 87 octane

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post #2 of 4 Old Yesterday, 03:51 PM
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I've never heard of a 4.0 turbo in the JL. There's the 2.0L turbo, which is what I have in my '20 JLU Recon. The owner's manual says 87 octane is acceptable or 91 octane premium for top performance.

From your owner's manual for the 2.0T:

This engine is designed to meet all emission requirements, and provide satisfactory fuel economy and performance, when using high-quality unleaded “regular” gasoline having an octane rating of 87, as specified by the (R+M)/2 method. The use of 91 or higher octane “premium” gasoline will allow these engines to operate to optimal performance. This increase in performance is most noticeable in hot weather or other heavier load conditions, such as while towing.
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post #3 of 4 Old Yesterday, 05:06 PM
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A lot of us are hoping and praying for a 4 litre turbo in the Wrangler...did you get a prototype???
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post #4 of 4 Old Yesterday, 11:56 PM Thread Starter
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Good grief ....I was think 4 cylinder and put 4.0. My bad
I meant 2.0. Thanks
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