great board. turned me into an oil junkie. through some advice on this board, I put mobil1 5-30 in a 92 acura legend with 40K on it. car sees some brutal conditions in toronto with a 3km drive to work and back and other short trips. rarely sees highway mileage. even though I admittetly was using the el cheapo crappy tire oil before with 3K OCI's, I am seeing some amazing results already from mobil 1. besides the fact that I can most likely extend the OCI to 5000miles which saves me time and hassle, this stuff cranks very quick in the morning, the car seems to warm up faster and a vibration that existed in the 1300-1500rpm area has all but disappeared. other than the cost, I just do not see a downside at all. I browse through this board almost everyday now and see mobil 1 put down more than any other oil that is discussed here. why is that? sorry for the long post and once again, fantastic board with some great people.