Hello everyone. I have spent most of the day reading through this site. What a great source of information! I have a 1996 Mitsubishi Montero 3.5 DOHC truck and just passed 100,000 miles last week. I bought the truck with 40,000 miles. The previous owner used DINO. I switched over to Mobil 1 SYN 15W-50 with the Mitsubishi oil filter after I purchased the truck due to oil consumption (2 quarts every 3000 miles) and wanting extended drain intervals. Well the M1 15w-50 stopped most of the oil eating and increased oil pressure (M1 OCI every 10,000 miles and filter changed every 5,000). I am debating changing over to something else though. I was talked into going to the 15w-50, even though my manual says to use 5W-30 or 10W-30 Big weight difference but almost stopped consumption. 2ndly Mobil 1 is a bit to pricey for me now. I am looking for a more affordable lighter weight combination that will correspond better with my manual, help consumption problem and work in 100 degree summers. So far I came up with Rotella 5w-40 synth (good for hot weather $13 a gallon) with an ACDelco filter due to a post I read earlier stating that the lifter noise decreased with this filter quiet a bit. In Houston TX. it gets extremely hot in the summer and the AC is working OT for months. I am going to leave the final decision up to you guys. Why not? This whole site is dedicated to oil? Almost forgot the truck drives 80% highway and does some nasty off-roading about once a month with my truck club.
thanks and looking forward to learning more on this site.