Got another question for the more experienced folks out there. In my browsing the site I've learned about UOAs and their use regarding engine maintenance which I see as an excellent tool for diagnosis on the condition of a vehicle. However I also see references where someone asks about whether oil A or B is better and someone almost always seems to mention something like "get oil A, its had great UOAs". Isn't that an apples to oranges comparison unless the vehicle the UOA was done on is identical to the vehicle in question with same engine, mileage, driving style, etc. In other words how much validity is there to someone saying that because they had a good UOA with Mobil 1 in their 2005 BMW with 5000 miles that I should use it in my 1990 Ford Ranger with 100,000+ miles on it or my 1999 Honda Passport with 70,000 miles.