Your driving cycle doesn't sound really heavy duty/severe service, especially with better quality synthetic oils. Get something like "Castrol 03086 EDGE Extended Performance 5W-20 Advanced Full Synthetic Motor Oil" which is MS-6395, and let the computer tell you when to change the oil. I've NEVER changed the oil at less than 5000 miles on a Chrysler product since the 90s, and all of mine have probably run well into the 300,000 mile range. My 92 Dakota 3.9 Sport had to have had over 300,000 on it the last time I saw it in 2011 on Father's Day (I know that truck, still had the dent in the front bumper from Ft. Sill in 95), and I think that was on Dino oil. I traded it at 192k in 2001. I ran dino and Amsoil in the 99 1500 318 and it had over 175,000 on it, running strong, when I traded it for a 2005 with a C motor (B series). I'm running M1 0W40 FS (MB 229.5) in the diesel Grand Cherokee (MB OM642, 2008), and she's over 150k. That one's at 4000 miles on the current oil, and I'm going to pull a sample to send to Blackstone next month. It runs nearly 10 qts and can handle OCIs up to 15k per MB, and that's WITH emissions crap on it. My next OC will be Chevron Delo 400 XSP 5w30. After perusing MB Bevo, the one after that will probably be the same spec in 5w40, since I can get that weight cheap at WalMart. MB Bevo shows Delo 400 XSP 5w40 on the 228.51 list despite it not being on labels or product data sheets.