This has been discussed in the diesel section but I wanted to get opinions here. I'm making the switch to 15W40 from 10W30 in my 2.7 Tacoma next week. I just want to give a thicker oil a try as it's getting hotter in my area. Rotella T is readily available at stores or at two local oil change shops. Convenient, convenient, convenient. Delvac 1300 is not as readily available though one shop has it in stock sometimes. Is there any reason not to go with Rotella? I just don't see much about it on the forums.