Newbie.. Mitsubishi DOHC oil recomendation

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Apr 16, 2004
Houston TX.
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.
Read this site and enjoy, but don't do nuthin. [Bang Head] Your current plan is excellent. [bowdown] If it works, don't fix it.
Wow I just read something interesting in my manual. Mitsubishi says to go 3000 miles on OCI DINO of coarse and 6000 miles on oil filter changes. The Mitsubishi oil filter has been bragged about as being the best for our motors for a long time on my Mitsubishi 4x4 forum... I did not know that. Do you think it is safe to run 6000 miles on my filter and 12,000 miles OCI on M1 15w-50? Assuming I stay with this oil after this post.
Castrol GTX Hi-Mi 10w-30 would be my pick. You seem committed to heavier weights, maybe Syntec Blend 10w-40 would be ideal for you. Twice yearly changes with the ACEA A3-rated (a Long-Life spec) Syntec Blend should work well.
Audi- The heavier weight oil was due to the 2 quart consumption from the old 10w-30. I was told Mobil is a bit thinner also so it should be a " lighter 10w-50 " Also I thought it would be a better choice to have a higher weight oil in blistering heat with no teen teperatures in the winter.
Originally posted by vmax: Audi- The heavier weight oil was due to the 2 quart consumption from the old 10w-30. I was told Mobil is a bit thinner also so it should be a " lighter 10w-50 " Also I thought it would be a better choice to have a higher weight oil in blistering heat with no teen teperatures in the winter.
I agree with haley10 above. You found a good combination why change it? Mobil1 15w-50 is a great oil, and at ~$20 for five quarts at Wally World versus $16.25 for five quarts of Rotella 5w-40, how much are you really saving? I also like the fact that you're changing the filter and topping off the oil in between doing a full change out at your extented OCI. Short of trashing your vehicle some other way, it should last for many miles with this combo. If you're really strapped for cash, you might consider Delo 15w-40 (~ $9.50/5qts) with the same filter and OCI intervals and use a SuperTech filter (~$2.00) instead of the AC. [ April 17, 2004, 07:53 PM: Message edited by: 427Z06 ]
Interesting replys. I feel better about my oil filter combo. I guess I was just worried about the thicker viscosity oil not getting to the top of the motor in time, cold starts are the worse. plus my manual says 10w-30 weight. Maybe I should end up in the middle with a 10w-40. It makes me wonder if my engine is getting oiled properly with the thicker weight. I am not at all familiar with the Delo 15w-40 weight just by the previous post it seems like a good alternative. I will do some research on that type. I also got a friend that gets Royal Purple at cost but I have heard nothing positive about the oil from this board compared to Amsoil or M1. Any other comments?
Okay Delo is chevron/Texaco should have known that one. I can't believe it is a DINO oil could be stable through my 10,000 mile oci. With filter @5k. I just figured it was an inexpensive blend or something. If this is true I just might be switching over.
My 3.0 Mitsubishi (92 Caravan) fatigued the oil after about 3000 miles. I too went to Mobil 1 ..same thing. Mine drinks it through the valve seals at idle (I don't know why it makes a cloud when you're idling ..but none while going down the road -head temp maybe?). I tried 15w-50 Mobil 1 and instantly got a lifter tap that never quite made sense. I won't go into details (too long) but I'm in a 4 season climate and get some sub-freezing weather. So I just changed the oil whenever it started using it (dino). In my situation (before the valve seals let go), I had ZERO consumption ..and then it would start using it regularly. This supported my theory of some type of oil fatigue (no UOA). So is your consumption "all the time" even right after an oil change ..or does it wait a couple of thousand miles and then start to drink it?
Stick with the 15w50 since you already have consumption issues. Just change it once a year if you are strapped. I wouldn't go longer than 10000 miles on the interval since you use your truck offroad. It would be better to do it twice a year. Daily Drives: -2003 Toyota Tacoma PreRunner XtraCab, 2.7 Liter , Mobil1 Synthetic SS 5W-30. ODO 8350 Miles. -1995 Toyota 4-Runner 3.0 V6, Mobil1 Synthetic SS 10W-30. ODO 84500 Miles.
My case the truck seems to drink the oil steady, 2 quarts a change cycle. I check it about once every 2 weeks. After the 15w-50 it is doing much better. I thought It was due to just mileage and wear. I have spent hours reading through this site to figure out my next change. I am down to 3 options. 1. Delo 15w-40 @ $9 a gallon and extended drain intervals. 3500 miles change filter run another 3500. it seems to be a favorite HDEO plus it is in a great weight for my app... HDEO 15w-40. 2. Rotella 5w-40 syn $13 a gallon a not sure on what I can do for odi with this one. Heard great comments from other mitzu owners on this site with this oil stopping noise, cleaning motor, and stopping leaks. 3. Stay where I am at $5.50 a quart M1 15w-50 OCI 10,000 filter 5,000.. Good combo but maybe I need faster oiling with a thinner oil? I did a search on this site regarding Southern heat temp and viscosity. it seems everyone agree's that a higher weight will do more good than harm in the south. Mitzu says to go with 30 weight. So maybe I will end up in the middle????? 40 weight?
Seems like you are set on a heavy oil. I just used a 50/50 mix of some 10w-30 and 10w-40 Superflow Semi-Synth on my lil cousin's Mitsu. I know it uses oil at 60,000 miles, but did not want to bog it down with strait 40 weight. Of your choices, Rotella is great, but consumption might be an issue. Since HDEO is an option and you want a heavy oil, the Pennzoil Long-Life 15w-40 is really thick, almost a 50 weight and it will help out the seals. It may actually work better than the 'ol Mobil 1 and will be a lot cheaper, definately good for long ocis too. [ April 18, 2004, 10:23 PM: Message edited by: Audi Junkie ]
Try the Chevron Delo 15W-40. When you do your normal mid-cycle oil filter change send a sample out for oil analysis to see how it is holding up. I bet that you can get good results out to 10,000 miles OCI on the Chevron Delo and save a few bucks. If the analysis comes back indicating the need to change then you can change it out. Data is always a good thing to make decisions by! John
Okay the Delro it is The savings, oci, and recomendations have me sold. I have heard nothing but great things about this oil. I never new a dino could make it that long on oci. Thanks for the opinions guys. I am close to buying a bulk supply so I want to get it right the 1st time. Now I am deciding on the filter for the beast. 1. $6.00 redesigned (in some opinions not as good) Mitsubishi filter. 2. Supertech filter.. Don't know much about this one but it was recomended here. $3.00 3. Ac Delco $3.00 I heard the bypass valve could be better, but a highly rated filter $3.00 4. WIX, Purolator are good choices also. I want a goooood flowing filter so I can keep the top end of the motor quiet. This filter will be changed out half way through the driving cycle. What is your vote? [HAIL 2 U!]
Go with the ACDelco PF1127. It helped quiet the valve clatter on my brother's '00 Eclipse V6 (3.0) and it works great on the '03 Montero V6 (3.8) I installed it on. I tried a Wix on the Eclipse but the valves were a little bit noisy after 3,000 miles.
The Motorcraft FL-810 is also a very good midpriced filter in that size, though sometimes it is harder to find than some other brands. John
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