Okay, shoot me now, but I'm going to start another oil thread. This one's a little different. Read on... I'm considering a little experiment with my 2000 CVPI. The Experiment My plan is to change my oil at 125k with a new batch of synthetic oil - Royal Purple, RedLine, Mobil 1, AMSOIL, or whatever - and then never change the oil again until the engine gives way. Everything will be documented as my hectic lifestyle permits. I'll do regular oil filter changes at 2,000-3,000 miles and top off with new oil as needed. I figure it'll take a half quart to a full quart to top it off after each filter change. This, of course, adds some fresh oil into the mix. The Car My car has almost 123k on the clock and it's been fed a regular dose Castrol GTX 5W-30 dino juice all it's life until I switched to Royal Purple 10W-30 about two weeks ago. I've always used Motorcraft FL-820S filters and would probably continue to do so. I'm open for suggestions on the type of oil and filter you guys would like to see me use. Whichever I choose, I will continue to use the exact same oil and filter until my engine self-destructs. As many of you know, this car is a marked police car (which I personally own) and is used for regular patrol duties, which oftentimes requires me to drive at 100MPH+ at the one extreme, and idle for extended periods (sometimes as long as 8 hours when I'm working off-duty jobs) at the other extreme. I have had only one used oil analysis done on this car. Blackstone Labs did it at about 110k and they gave a glowing report on the internal condition of my engine (for whatever its worth). Also, I live in the Houston, Texas, area, so our weather is consistently in the 80-100 degree range. Why Am I Considering This? Honestly, I really don't have much to lose. Many of you know that I already have a brand new 4.6L sitting on a stand in my garage, just waiting for its turn. So why not put one of these synthetic oil companies to the test and see how good their products *REALLY* hold up??? Here is a photo of my backup plan: I am not being compensated by anyone. I *do* have one individual who has hinted that he would cover the cost of the oil and filters if I actually follow through with my experiment. He's not affiliated with any oil companies in any manner - he's just another gearhead who wants to see what'll happen. Well??? Flames, suggestions, and comments are welcomed. First, which brand of oil would you like to see me use? Second, which brand of oil filter would you like to see me use? Third, do you think I can hit 200k without any oil-related engine failures? I think it's very possible and I'd like to see if the 4.6L cop car is up to the task. I will ultimately make the final decision since it's my car we're talking about, but I will definitely take your suggestions into consideration.