I've been studying the forums for a little while trying to decide what to run in my new car. It's a 3.0L V6 SOHC that I'll probably run a bit harder than average. I do 12 miles to work in moderate traffic, with lots of highway trips on weekends that makes my mileage range from 12-20k/year. Manual says 5W20 or 5W30 temporarily (supposed to switch back to 20 afterwards) at 3750/7500 mile intervals. I live south of Atlanta though, so I'm not sure about 5W20. I'd prefer Mobil 1 every 5k, but do I run 0W20 or 5W30? Or should I run Pennzoil dino every 3k? Since its a Honda, I'd like to keep the moly high (is that right?) I've got 4500 miles (Castrol GTX 5W20 from the dealer - long story) on it now, I put 3k on the factory fill. I wanted that out earlier but manual says to leave it in for full cycle, so I just went with the standard 3k. If I'd known better I would have at least replaced the factory filter with something better. What takes precedence: living in a warm climate or factory rec for small clearances? I think I'm leaning towards Mobil 1 0W20 most of the year, and 5W30 in the heat of the summer. Is the filter dependent on the oil I use, or can I determine that as a separate issue?