I wasnt sure which one recommend for my Jeep '96 Cherokee 4.0 with 130,000 miles. I saw Mobil 1 Delvac 1300s 15w-40 at Autozone and I could not find Chevron Delvac 1 5w-40. I am running with Mobil 1 Full Syn 10w-30 (now 8500 miles). I awaits hear from you guys recommend. I checked the search on BITOG and there have so many info and hard to decide.