Do you guys notice a difference in how your engine runs after an oil change?? I ask this because I changed my oil today after 10 months and 5000 miles and I wasnt even paying attention when I took the car out for a spin for no apparent reason and half way thru my drive I realized how much smoother my car runs. I know some will say that it is a "placebo" effect but when that is the furthest from your mind and you realize it, there must be some truth to it. FYI, the car is a 2006 Lexus ES330 and has gotten a steady diet of Pennzoil Platinum, now with 37,000 miles. Anybody besides me feel the same way?