Well, I changed out the oil and the 2nd dose of Kreen today after having it in my sump for almost 1.3K miles. For this second dose, I had added 12 ounces to the gas in the beginning of the run and 16 ounces in the sump. Total miles on the oil and Kreen is just over 5K.
The oil came out pretty clean for the 2nd run which leads me to believe that the 1st dose got all, if not most, of any build up in the engine. IMO...the second dose was really not necessary.
Most of my driving here in Orlando consisted short trips and day trips to South Florida, Tampa, Daytona and Jacksonville Beach, Florida.
I'm quite please with the condition of the oil and the filter after using this Kreen motor tonic and my T4R is running smooth and quiet. I refilled the sump with 3 quarts of Mobil Delvac Super Diesel Dino, 15w-40 and
3 quarts of Mobil Super Synthetic 0w-20. This blended mix for a synthetic blend should get me going and hopefully last till the summer and maybe longer. I replaced my oil filter with an over-sized Bosch D+ for this current run.
Anyway...there you have it. My 2 treatments of Kreen motor tonic and I'm ready to roll. Judging from how clean my oil and filter were when changed, I feel confident that the inside of my engine is spotless and any varnish stains were removed with the second dose of Kreen.
I also changed out my Fuel Filter and bracket which needed a change in a bad way after 50K of driving. Between the Kreen and the new Fuel filter it feels like I picked up 25 hp with this service.