What ever is the cheapest and every 4th tank with Chevon for the Techron. At my old house I would just buy from the local grocery store as they got ether Shell or Chevon.
I once tried distilled water for my blinkers but found the performance was not what I wanted...so I switched to the Jeep/Fiat/Chrysler/Ram branded fluid and felt much better knowing I was going to retain my warranty...costs a lot more, but it's sure worth it....
The cheapest 87 octane I can find. Which means it's usually Shell and fortunately I get $.05 a gallon discount for being in their loyalty program.
OM says 87 octane, so that's what I use. The only thing I have that I will use E15 in is the WK2 and that's because the manual says I can. The JK is a 12 and says E10 or less than 10% ethonol.
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