Silver bottle of Diesel kleen for my 01 Cummins and Hot Shot EDT for my 05 VW. Also Cummins get 1oz to 1 gallon of what ever motor oil I have left and VW gets 1 oz to 1 gallon of 2 stroke oil. I drive VW everyday and since it has all mufflers and cat I try to keep it clean, Cummins driven once a month and is straight piped and burns what ever I get my hands on.