Hello - I am at the end of my rope with a problem with my daughter's 2007 Toyota Camry. We purchase the vehicle not knowing that for the 2007 Camry has a defect in terms of the piston design. Apparently the pistons used for this year do not have sufficient drainage behind the oil rings. This causes the rings to gum up (badly) which results in an oil burner. Toyota issued a recall for this year and model where they actually pull the pistons out and replace them with a new modified piston that has adequate drainage. Unfortunately when I purchase the car I just missed out on the warranty extension. I tried to work with Toyota Corporate and they were not willing to budge to help me. I am a fairly good shade tree mechanic and I have a great deal of experience building engines however I REALLY don't want to have to do this job (pull head, pistons, etc.). Additionally I've read that the Toyota 2.4L engines used in the Camry have a common problem with stripping the head bolt threads in the block when removing the cylinder head. This really makes the job unattractive. So - my question to Barryman is which of your products is best suited for I guess what is called a cylinder soak ? Yesterday I actually purchased a gallon of Chem Dip off Amazon but then today read on your Q&A section that the B-12 product works better for a cylinder soak. Here is what I found on your site: Neither of the Berryman Chem-Dip products (0905 and 0996) are suitable for a cylinder soak because of the lack of combustibility and their incompatibility with motor oil. However, Berryman B-12 Chemtool Fuel System Cleaner (part #0116) is ideal for your application and you’re on the right track with your methodology. To use 0116 for a cylinder soak, pull the plugs, put 0116 in each cylinder, let the product soak for 30 minutes to 2 hours, and then remove the mixture from each cylinder. Repeat as necessary So what I don't understand is the statement = "lack of combustibility and their incompatibility with motor oil" From what I've read on the Internet the Chem Dip product is VERY strong and good at removing carbon deposits. I just don't understand what is meant by the lack of combustibility - I planned on soaking for a few hours then removing the Chem Dip from the cylinders using a pump then repeating the process several times. The Chem Dip that drips into the oil will be removed at the end when I drain the oil before restarting the engine after the cylinder soak process. This being said how do you recommend I approach this ? Should I cancel my order of Chem Dip from Amazon and place a new order for a gallon of B-12? This is a very common problem and I am sure that there are lots of Toyota owners that would benefit from a successful outcome using your products. I would love to be your "poster boy" for this common problem. regards Kerry Donahue - Carmel NY