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SUVs Jeep Liberty and Jeep Liberty Diesel Jeep Liberty Diesel Oil Questions
48 messages, Last post on Aug 21, 2009 at 2:25 AM
You are in the Jeep Liberty and Jeep Liberty Diesel Forum. Your Hosts are steve_ & tidester
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Hi to all, I have a 06 Jeep Diesel 20,000 miles and for the most part like the vehicle. The ONE big issue is the engine oil: Currently change it every 6200 miles Use Mobil 1 (0-40W synthetic) Wix filter At best ½ quart of oil used between service My question/concerns: As a long term diesel vehicle owner (30 + years) Im amazed at how dirty (ink black with soot) the oil in the little Mercedes gets within 5 minutes of running with fresh oil the oil is black. In comparison my Dodge Cummins with 200+K miles or a John Deere Tractor with 8600 hours produces much cleaner oil even after 2000 miles on the oil. Nonetheless, is this: Dirty (looking) oil a concern What is the preferred oil choice we live in eastern WA with some extreme temps. 0-100 degree range. 90% of the driving is my wifes 100 mile interstate daily commute I like & use Rotella (15-40W) in my other vehicles & would like to switch to something else in the Jeep. Any input will be appreciated, Mike (imthomas  nwi.net)
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Replying to: imthomas (Mar 09, 2007 8:25 am) I started out using Mobil 1 0w40 oil then switched to Mobil 1 5w40 until it was not readily available. I also use Wix oil and air filters. I developed a ticky lifter using Mobil 1 and switched to Rotella T 5w40 synthetic and the ticky lifter went away and has not returned - maybe nothing to do with the oil - just coincidence. Oil changes are at 6k miles and the level on the dipstick drops maybe 1/16 inch in 6k miles (35k miles on engine). Black oil is normal on EGR valve engines and none of us worry about it. It's almost a shame to dump new high quality oil in one of these engines considering what it does to the oil.  The issue is that the soot in the oil must be low enough concentration to remain in suspension in the oil. If you wanted to run your oil 12k miles or more you might want to have the oil tested to be safe. This is not an issue at 6k miles.
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Replying to: siberia (Mar 09, 2007 8:36 pm) Nescosmo....
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Replying to: nescosmo (Mar 10, 2007 9:10 am) Are some of the engine combustion chamber use the oil different when cooling the cylinder than others? There have been advancements through time to obtain more complete burning and higher efficiency in diesel engines. The EGR valve seems like a step backwards to me. please clear my dumfound. I cannot. The only thing I can offer is that Rotella T diesel reads on the container that it contains "Advanced Soot Control" meaning that the maker expects soot in the oil and soot leads to black oil. It would seem to me that in an engine where the rings are sealing very well there would not be much blow-by and not much soot in the oil. Does the CRD have excessive blow-by relative to the Sprinter? Once again, I cannot answer that question relative to the Sprinter. You do make an interesting point.
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Replying to: nescosmo (Mar 10, 2007 9:10 am) I looked on the Sprinter forum and there is some talk about black oil - but not much. My recollection when reading about the Sprinter is that it has a smaller turbo that spins up faster to reduce turbo lag, so the Sprinter may not run as high a boost as the CRD producing less blow-by. The engine might be made a little better with better control on the systems. I work in a downtown area where I see Sprinters almost on a daily basis and I have never seen so much as a wisp of smoke exit the exhaust on one. Some of them are being run pretty hard, too.
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Replying to: siberia (Mar 10, 2007 10:07 am) In the EU, this denomination relates to engines that use the particulate filter on the exhaust system. This is also a prolonged duty lubricant, usually good for 20,000 miles or more. I checked the specs of the Sprinter (in Luxembourg), and it's supposed to run 30,000 miles between oil changes when used intensively in a fleet. In such a case the engine has very little time to cool down and humidity doesn't have a chance to get into the block. |
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Replying to: siberia (Mar 13, 2007 3:10 am)
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Replying to: nescosmo (Mar 14, 2007 4:38 pm) Sorry, Nescosmo I have no opinion on which dealer. No blow-by hoses are clean as the first day i bought it Do you have a different crankcase ventilation system on you sprinter than the CRD? Those crankcase fumes have to be going somewhere.  Maybe there is something different with the CCV design? I checked the CAC hoses on the CRD today and they are starting to dry up at 35k miles. At 6k miles the hoses were all snotted up. Now there is a very thin almost dry layer of oil and the oil seeping at the clamped connection on the input side is almost clear, not black. The oil on the dipstick is better too. When I rub it between my fingers it feels slicker and wipes off my fingers with a rag. At 6k miles I had to uses a cleaner to get the oil off my fingers.
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Replying to: siberia (Mar 18, 2007 4:14 pm) Can i use those metal tubing that they use on the bathroom exhaust fans or just buy the hoses at the dealer.
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Replying to: nescosmo (Mar 19, 2007 10:43 pm) |
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