Anybody got any thoughts? I've been reading all over other diesel forums, mainly with the full size trucks since there are so many diesel engines there. Some people call it flat out snake oil, others think it can't hurt. I've put the Power Service Diesel Kleen+Cetane Boost in 2 tanks so far. Certainly can't tell any difference in performance. I figure, nothing in the Jeep info says to not do it, just says supplements aren't necessary. If it can improve mileage a tad by increase cetane numbers, and if it can actually increase lubricity of the fuel to get more life out of the injectors, why not. Curious to see if anyone else had any thoughts or plans to use it.