Hey, new poster here! I have a 2004 Volvo S60 (non turbo) that appears to have some [censored] ring sealing. I have spent the past several days googling "site:BobIsTheOilGuy.com" looking for information and I have come to the conclusion that there are two options for me. 1. AutoRX. Seems to be preferred by most. 2. LC20. There...isn't a lot of information out there. My problem with the information I keep finding here is everyone is more concerned about cleaning sludge out of the crankcase and out of the head. I don't have this problem. I change my oil every 2,500 miles (only because I drive in really [censored] city traffic and I get oil at no cost) so there is zero issues with buildup in the engine itself. My car has been feeling really slow lately and I had enough. I did a compression test. I had 150PSI on all five cylinders. A wet test (with ATF) brought it to 190 across all cylinders. I'm assuming my [censored] two hours a day idling in traffic jams has plugged my ring packs with carbon and they aren't sealing correctly. I have left the ATF in the cylinders for the weekend in an attempt to break down this carbon and bring that 40(OMG)PSI back to my cylinders. If this works, what should I do to keep it away? Auto RX maintenance dose or LC20 as the instructions say? Thanks for the information. Sorry if I missed a thread but I Googled a LOT before joining and asking because I don't need a cleaner for the sump. I need a cleaner for rings only.