Bought a Nissan Titan truck in February. I changed the oil once at 1000 mi with Castrol 10-30 for break-in and am ready to switch to a long term oil/ possibly synthetic at 3500mi. My main issue is that most trips are short 5-25mi, in stop and go traffic, often with a moderate (500-5000lb) load (landscaping), (with a trailer). Very few hwy miles... Temps in the NYC area vary between 0-100 F. What oil would be best for a long engine life in these start/stop conditions? I have searched the fourm, but am a little confused... Thanks!