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I have a 07 jeep with the mercedes diesel.This past monday the check engine light came on and the jeep was very low on power.Took it to the dealer and was told that the intake runners were all sludged up and that repairs,including parts and labour would be roughly 4000.00!!!! I ahd no choice but to let them repair it.My question is,does anyone know of a good fuel additive that can be put in to help stop this from happening again.It has 60,000 miles on it,and is driven on the highway 3-4 times per week.The dealer says the cause of this problem is the engine not getting warm enough and also me using inferior diesel fuel.Is there any truth to either of these??Driving it on the highway should get it plenty hot enough.Some have suggested additives from Lucas,but i would like some more input before i add anything to the fuel.