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JL 4.0 Turbo gas Choice Question

2K views 4 replies 4 participants last post by  Jeepsr4me 
#1 ·
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
 
#2 ·
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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