I purchased a used 2006 dodge 2500 dodge diesel with 38k on the clock. i noticed a leak on the transmission at 40k. i called the dealer and all i heard was about the deductable. fine, i called the company. ohhhhh sucks to be you.. out of warranty. i remember using your product for a steering leak i had on my toyota. i put your transmission product in and after a few miles i noticed smoother shifting (sweet). after a week i noticed...you guessed it no leak. going to use yor gear oil next. awesome product!!!