I used my first Kreen treatment in the dead of winter. I had 2.5K miles on the oil when I added 18 ounces of Kreen to the sump. I then completed a high speed RT drive to South Carolina and back. I changed out the Kreen and Oil a couple of days after I arrived back and the oil was black as soot. My engine runs quiet and smooth and I still don't have any oil consumption problems.
I found that my second treatment of Kreen was really not necessary. The oil and Kreen that was drained after a 1K mile daily normal usage came out very clean without any visible dirt, solids or waste.
IMO....One treatment is all that I really needed for my T4R. The long distance, High Speed, Highway driving in the winter did the trick and lifted and cleansed the engine. The oil filter that I removed was quite heavy after I removed the filter mag and the sediment and "Black Jello" poured out of the oil filter canister.
I found that my second treatment of Kreen was really not necessary. The oil and Kreen that was drained after a 1K mile daily normal usage came out very clean without any visible dirt, solids or waste.
IMO....One treatment is all that I really needed for my T4R. The long distance, High Speed, Highway driving in the winter did the trick and lifted and cleansed the engine. The oil filter that I removed was quite heavy after I removed the filter mag and the sediment and "Black Jello" poured out of the oil filter canister.


