Hi again, I know I have seen here that someone had made a post on oil but I can't seem to find it. When I was in school for Aviation mechanics I was told oils that are derived from Petroleum were better for picking up and suspending trash until it is removed from the oil by the filter, On the other side Synthetic oil is best at not loosing its lubricating properties or simply just not breaking down but it is poor at removing or suspending trash like Petroleum oil, and that's why at least in 2005 it was still recommended to use petroleum oil in light aircraft and not synthetic because of the high amounts of trash present in most light aircraft not including fuel injected engines. So my question is, since diesel engines are dirtier than gas I would think it would be best to use a petroleum oil of the same weight. What are your thoughts.

_________________
John G.
2011 Dodge Avenger 3.6L
2006 Jeep Liberty CRD Limited(welcome to the family)
1992 Dodge D250 Cummings
1966 M151 A1
1961 Corvair Monza coupe

I won't get into all of the whys and what nots, the bottom line is this: The Owner's Manual says to use synthetic oil. They strongly recommend that the owner use an oil that meets the DiamlerChrysler Material Spec MS10725.

They have just recently changed their marketing for this particular oil, but the Amsoil 5W-40 European Spec Oil, code AFL, meets the above mentioned standard, along with many other Manufacturer Spec standards such as M-B, BMW, Porsche, Audi and VW. There is also a Pennzoil, available at your local Mother Mopar dealership, that also meets the MS10725 spec. The Owner's Manual does reference a version of Mobil 1 to use, not sure if it is still a valid choice. In any event, I suggest the 5W-40 over the 0W-40.

I can't speak to the level of "trash" that is found in an airplane engine versus a diesel. Diesel oil gets dirty due to the combustion process and, if equipped and functional (hint, hint), the EGR Valve that dumps exhaust soot back into the engine in order to satisfy the Eeeeee Peeeee Ehhhhh weenies in Warshington Deee Seee. I don't think that the line of thinking as it relates to an airplane engine versus a diesel crosses over very well, especially with this Italian Mistress of a mill.

Oils are like opinions, many have them and are quite willing to justify their position. I'll simply say that this Amsoil AFL oil is all that I have used in my CRD since 85k miles, now at 133k miles and it runs like a champ. Thanks too to Green Diesel Engineering and a heavy right foot. Hope this helps.

_________________
FWIW,
Hoosier CRD

#1 Liberty: '05 CRD Limited Stone White
(SOLD Dec. 2013)
#2 Liberty: ???
"Why guess when you can know?"- Carroll Smith

Hey thanks for the input, I was kinda wanting to stick with what the manual says but at the same time in the back of my head I was thinking maybe i should see what others thought. Has anyone else used Rotella T1 synthetic I always use Rotella non-synthetic oil in my Dodge diesel. Thanks for the input again, and happy holidays.

_________________
John G.
2011 Dodge Avenger 3.6L
2006 Jeep Liberty CRD Limited(welcome to the family)
1992 Dodge D250 Cummings
1966 M151 A1
1961 Corvair Monza coupe

I doubt if anyone is using Rotella T1 as that's a single weight oil. As far as I know all of us using Rotella use the T6 5w-40. There is lots of debate on the forum about various oil (brands, weights, type, etc). For what my opinion is worth use a name brand full synthetic diesel rated multi-weight oil (be sure you understand what multi-weight oil rating means) combined with a quality oil filter (I use WIX 51515 or equivalent NAPA which allows for an even 7qt full fill - others like a finer 2micron aftermarket filter rig) AND forget about extended oil change intervals (risk not worth the cost savings in oil/filters) and stick with a 6,000 mile or so oil/filter change interval. In addition get a GDE tune to reduce EGR use and hence soot addition to the oil.

_________________
Sold to LOST member my 05 Ltd, GDE Stg II turbo + TCM tune, SunCoast TC w. Transgo kit, Steiger window regulators, Samcos, Fumoto valve, 2nd gen filter head with Lub. Spec. bleeder, Hayden clutch & 11 blade fan, inverted spare, P-1 battery, BF Goodrich Long Trail TAs, Etecno1 glow plugs, timing belt at 50K miles/8 yrs

I don't know a thing about aircraft engines myself, I only know what I learned from owning and maintaining cars. Then I got this diesel and had to learn about how what I knew applied to that plus what I keep learning. when I came here while looking at buying a CRD I asked tons of questions about oils and routine care. I was directed by the others here that Mobil one in 0w40, 5w40, Rotella T6 5w40 or Amsoil were the ones to choose with a good quality filter. I stay with the Rotella T6 because it is the easiest for me to find locally and best price. I use the NAPA gold filter or Pure one mostly but have use a Motor-craft filter once. I been doing this since 38,000 miles and now have 78,000 with a GDE tune since about 50,000. My engine still runs great and when I get an oil analysis it shows good low wear numbers, they have been even lower since the ECO tune to boot. I set the evic to remind me to change the oil every 6,250 which is about what Papa is saying. the oil is cheap compared to the cost of this engine.

_________________
2006 Liberty CRD Limited Deep Beryl Green Metallic Clear coat, Fumoto valve, MH ProVent (removed), GDE Eco tune,
OME 790/948 springs, OME struts, OME N132L shocks, Jeepin by Al A-arms, Hercules Terra Trac AT2 245/75R16
Weeks Stage 1 EGR delete, 5 volt steel glow plugs

I am familiar with two families of turbo-diesel auto engines: the one in my CRD and the one in my VW Jetta TDI. Both are European designs, and both mfgs specify synthetic. The reason given is that while the engine itself is not particularly severe service, both use engine oil to cool and lube the turbo, and there the oil is subjected to some very severe temperatures, which petroleum based oils do not handle well.

Did your training include the fact that diesel rated oils are designed to keep the soot that diesels generate in suspension better than gasser oils?

Don't overthink it, and don't try to out-guess the engineers who designed the engine and specified synthetic oil. Trust that they know a thing or two.