Long time member here. Finally coming back since my 2jz turbo days running GC. Now driving something more economical. I just picked up a used Lexus CT200h with 125k miles. Previous fills were done at the dealership 0w20 conventional. After the first week of owning it I noticed high oil consumption 0.5qt/600mi so I did a top piston soak with MMO and GM top engine cleaner. Hoping to free up the piston rings and planning on running Synthetic Maxlife 10w30 (or any suggestion?). The first 2 pics are after an overnight soak of MMO. The carbon was very soft and was easily scraped off when my endoscope touched the carbon. The 2nd 2 pics are after a 2nd night soak with 50/50 mix of MMO and GM and a couple dry cranks. Last pic is from the last the soak.