A quick rundown, because I can't expect you all to keep track of my oil consumption! Vehicle: 1996 Audi A4 Motor: 2.8l V6, 12 valves Oil consumption used to be under 1/3 qt per 10k miles with Syntec 5W-50. Keep in mind I may hav been using the PAO 5W-50 back then instead of the hydrocracked bastrat Castrol has been selling the past few years. Oil consumption with M1 5W-40 was initially about 0.5 qts/1k miles, tappering off to about 0.3 qt/1k miles over 8k miles. A UOA was performed at that time. I then started and ARX treatment (in M1 5W-40) and began using FP. Oil consumption was unchanged during the cleaning phase. I'm now 800 miles into the rinse phase with DELO 400, and oil consumption has dropped to non-noticeable. In another 1200 miles I will switch back to M1 5W-40 and after 8k miles I will again have a UOA performed and compare to the previous run of M1 5W-40.