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Jeep Liberty, Diesel
#2 of 51 Re: Recommended Jeep Liberty Diesel Oil [imthomas]
Mar 09, 2007 (9:36 pm)
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.
#3 of 51 Re: Recommended Jeep Liberty Diesel Oil [siberia]
Mar 10, 2007 (10:10 am)
Siberia...Mike situation is like mine; I have a Dodge Sprinter with a 2.7 five cylinder engine and the oil stay clean for must of the time that stay there; I change my oil in the Sprinter at 10K and you see the dipstick clean but the engine have 9 1/2 gallons in it. The CRD have 6+ and is a 2.8. The Sprinter have an EGR valve. Are some of the engine combustion chamber use the oil different when cooling the cylinder than others?. please clear my dumfound.
#4 of 51 Re: Recommended Jeep Liberty Diesel Oil [nescosmo]
Mar 10, 2007 (11:07 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.
#5 of 51 Re: Recommended Jeep Liberty Diesel Oil [nescosmo]
Mar 13, 2007 (4:10 am)
Nescosmo, just an after thought:
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.
#6 of 51 Re: Recommended Jeep Liberty Diesel Oil [siberia]
Mar 13, 2007 (5:52 am)
"Advanced Soot Control"
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.
#7 of 51 Re: Recommended Jeep Liberty Diesel Oil [siberia]
Mar 14, 2007 (5:38 pm)
Siberia....No blow-by hoses are clean as the first day i bought it. I use Rotella 15w-40 dino have 17k with no engine problem. tranny just developed an oil leak, -very small-, will take to dealer next week. I have a freighliner (check spelling)in town I think that they will be better than dodge dealers. What do you think.
#8 of 51 Re: Recommended Jeep Liberty Diesel Oil [nescosmo]
Mar 18, 2007 (5:14 pm)
What do you think.
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.
#9 of 51 Re: Recommended Jeep Liberty Diesel Oil [siberia]
Mar 19, 2007 (11:43 pm)
Siberia... If i run out of warranty on the CRD and have to replaced the CAC hoses, what type of hoses should i use.
Can i use those metal tubing that they use on the bathroom exhaust fans or just buy the hoses at the dealer.
#10 of 51 Re: Recommended Jeep Liberty Diesel Oil [nescosmo]
Mar 20, 2007 (3:25 am)
Nescosmo, I have only ran full boost a couple of times and that was to obtain the measurement on a scan tool just to see what it was. I don't blow its nose by wide open throttle so I expect my hoses to last a very long time. The CAC hoses do not show any signs of deterioration at 35k miles. I will probably look around to see what is available when it happens. Some nice stainless steel or polished aluminum tubes with flex couplings would be nice but also very expensive.
#11 of 51 Re: Recommended Jeep Liberty Diesel Oil [imthomas]
Apr 18, 2007 (1:32 pm)
April 18th - As a follow up:
Based on what I read here as well as Shell/Rottella's suggestions I did switch to the Rottella 5w30 and the oil seems cleaner - but we only have 3000 miles on this service.
A new question: Are there any suggestions on miles between servicing with the new oil - given the same driving conditions?