I don't have any experience with Kreen. But I have used ARX on my 2000 Tundra V-8 that had mild deposits, but no heavy sludging. At 138K miles in 2007 I had the bank 1 cover off and saw reddish brown slime and varnish covering everything. I did two ARX treatments and at 195K miles last fall here is what bank 2 looked like:
http://www.s2ki.com/s2000/gallery/album/38264-tundra-bank-2-195k/
I don't have pictures from my 138K view, but these pictures show some remnants of what I was dealing with. It is much better now, but I decided to give it another ARX treatment this summer. In fact, I just changed out the clean phase oil yesterday and started the rinse phase. While I was under the truck I noticed a crank seal seep had dried up as well.
I think my problem was PCV maintenance, or lack thereof. Oil changes were 3-5K since new. It has 200,400 miles now and turned 13 years old today. It still runs great!
I like ARX for seal leaks and deposits. It's slow, but safe.
Good luck with whatever you choose to do.
http://www.s2ki.com/s2000/gallery/album/38264-tundra-bank-2-195k/
I don't have pictures from my 138K view, but these pictures show some remnants of what I was dealing with. It is much better now, but I decided to give it another ARX treatment this summer. In fact, I just changed out the clean phase oil yesterday and started the rinse phase. While I was under the truck I noticed a crank seal seep had dried up as well.
I think my problem was PCV maintenance, or lack thereof. Oil changes were 3-5K since new. It has 200,400 miles now and turned 13 years old today. It still runs great!
I like ARX for seal leaks and deposits. It's slow, but safe.
Good luck with whatever you choose to do.
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