We have been experimenting with all avenues to solve the problem for two months with no positive results. After talking to you about adding the DuraClean LSC to the oil that we were using, in only two weeks, we noticed the hard pieces of burnt oil (coke) had liquefied, and we were able to clean the lines out with just air pressure. Our system is as clean as a new unit. We were on the verge of purchasing a complete new unit, on which we could have spent more than $20,000.00. Instead, with your suggestions and your product, our old unit has many more useful hours.