We are always talking about light bodied flush's and other solvent products burning off! I decided to test this. The car is known to not burn oil. It is running a conventional 15W40 oil. I put a solid 1000 miles on the fresh oil prior to adding the solvent. The oil level based on dip-stick was perfectly at the top of the full mark! I added exactly 8 ozs. of MMO to the cold oil. I then started the engine up and let it run for 10 mintes and shut it down. I went inside and made a kettle of tea. I came back out side and rechecked. The oil was over full now by 8 ozs. I marked the dipstick to keep track of this. To date it now has close to 3000 miles on the oil and 2000 on the oil MMO experiment. The oil level still reads 8 ozs. high on the dipstick. It would appear that adding a solvent to the oil changes the charistics of the solvent drasticly. In an engine that does not burn oil it is unlikely that solvents added to the oil are going to burn off any more then the base oil will. Surely their is a limit to how dilluted you make the oil prior to the base stocks charistics changeing so much as to allow for increased volitility due to solevent dilution. MMO was used because it was available. 8 once dosage was chosen due to concerns for acelerated wear due to solvent dilluteing the base oil. I did this to try to figure out how long a solvent type of chemistry could be expected to work in an engine. Some say that they boil of quickly while other insist that their chartristics change once introduced to the base oil. Terry Frank and Bob had this discussion once when discussing the charteristics of Auto-Rx as compared to Nuetra 131. Bob insisted that Nuetra 131 would not burn off quickly and I am now inclined to belive him! Driveing is now a composite of 90% City 10% HWY. Usualy I drive 90% HWY and 10% city. They are doing construction on the HWY I take to work so I am going 20 miles through the city instead of 20 miles on the HWY to and from work!