Oil Om617
Oil Om617
(02-03-2011, 10:51 AM)winmutt 5w40 Synthetic.
+1
Also, you don't need to change it for at least 15,000 miles (24,000 km). If you're skeptical of this, get an oil analysis performed and see for yourself.
-Tyler
1984 Volvo 760GLE Turbo Diesel D24T/M46
1986 Isuzu Trooper Turbo Diesel
No mercedes (for now)
(02-03-2011, 10:51 AM)winmutt 5w40 Synthetic.
+1
Also, you don't need to change it for at least 15,000 miles (24,000 km). If you're skeptical of this, get an oil analysis performed and see for yourself.
-Tyler
1984 Volvo 760GLE Turbo Diesel D24T/M46
1986 Isuzu Trooper Turbo Diesel
No mercedes (for now)
0w30 would probably offer easier cold starting, better fuel economy, and slightly reduced engine wear compared to 5w40. The only disadvantage I see (and the reason I use 5w40 rather than 0w30) is that it's the only viscosity of diesel engine oil that's widely available and easy to find in full synthetic. Although the regular mobil 1 is technically a diesel rated oil...
-Tyler
1984 Volvo 760GLE Turbo Diesel D24T/M46
1986 Isuzu Trooper Turbo Diesel
No mercedes (for now)
My general opinion is that the practical lower limit on viscosity comes from whatever is necessary to maintain sufficient oil pressure when warm at idle. Otherwise higher viscosity is just wasting energy, and providing worse lubrication when cold... I think 5w40 is "overkill" in being excessively thick, unless your engine has very worn bearings or some other reason why pressures would drop dangerously low at idle when hot.
0w30 would probably offer easier cold starting, better fuel economy, and slightly reduced engine wear compared to 5w40. The only disadvantage I see (and the reason I use 5w40 rather than 0w30) is that it's the only viscosity of diesel engine oil that's widely available and easy to find in full synthetic. Although the regular mobil 1 is technically a diesel rated oil...
-Tyler
1984 Volvo 760GLE Turbo Diesel D24T/M46
1986 Isuzu Trooper Turbo Diesel
No mercedes (for now)
http://www.liqui-moly.de/liquimoly/produ..._2050.html
-Tyler
1984 Volvo 760GLE Turbo Diesel D24T/M46
1986 Isuzu Trooper Turbo Diesel
No mercedes (for now)
If I could buy it locally, I'd probably use Lubro Moly Synthoil Energy 0W-40 in MB and VW diesels. There seems to be some question over weather Mobil 1 is still made from group IV synthetic base stocks or not, whereas Lubro Moly (and Amsoil) are explicit about which base stocks they use. The Synthoil Premium 5 W-40 isn't really synthetic (group III).
http://www.liqui-moly.de/liquimoly/produ..._2050.html
-Tyler
1984 Volvo 760GLE Turbo Diesel D24T/M46
1986 Isuzu Trooper Turbo Diesel
No mercedes (for now)
i have a newer S-class mercedes gas engine and when i purhcased the car the recommended oil was mobil 1 0w-40 european formula. It can be purchased at autozone.
over the past couple years they changed the recommendation to 5w-30 and now they changed the recommendation again to a 5w-30 ESP formula.
diesel engines require a higher weight oil and a minimum of 5w-40 weight. if you put the 0w-40 you will probably ruin the engine.
W116Lorinser
02-05-2011, 10:29 PM #7In my diesel i use Mobil 1 delvac 15w-40. its the recommended oil and best/correct type of oil for the 617 engine. you can also use a 5w-40 sythentic oil which is good but i prefer the 15w-40.
i have a newer S-class mercedes gas engine and when i purhcased the car the recommended oil was mobil 1 0w-40 european formula. It can be purchased at autozone.
over the past couple years they changed the recommendation to 5w-30 and now they changed the recommendation again to a 5w-30 ESP formula.
diesel engines require a higher weight oil and a minimum of 5w-40 weight. if you put the 0w-40 you will probably ruin the engine.
(02-05-2011, 10:29 PM)W116Lorinser diesel engines require a higher weight oil and a minimum of 5w-40 weight. if you put the 0w-40 you will probably ruin the engine.
Do you have some citation or evidence of this? 5w30 is the oil factory recommended by Mercedes for cold climates (//edit: 5w30 synthetic is factory approved for the OM617a for all temperatures, non-synthetic for temps below -5C). A 0w40 is thicker than 5w30 when warm, and only thinner when cold- where it will provide faster cold cranking and quicker oil circulation. Even a 0w40 is thicker when cold than a straight 50w is when hot- and thicker than the engine requires for optimal lubrication.
I suspect that the idea of higher viscosity oils providing superior lubrication or protection is a myth, especially given the properties of modern synthetic oil which have more stable viscosity at high temperatures. It probably originates from experience with ancient single viscosity non-synthetic oil in engines with very worn bearings, or extremely old engine designs machined to loose tolerances, whereby the bearing clearances were such that the engine essentially lost oil pressure at warm idle, causing rapid engine destruction. This could be mis-interpreted as failure of the oil to lubricate, when in fact the part(s) that failed were running without oil.
Thick oils like 15w40 offer enormous disadvantages:
1) Slower cranking and a significantly higher minimum temperature at which the engine can start
2) Increased engine wear on cold start due to longer time to achieve full oil pressure
3) Decreased fuel economy
4) Decreased oil flow volume (more oil returned by relief valve due to unnecessarily high pressures)
-Tyler
1984 Volvo 760GLE Turbo Diesel D24T/M46
1986 Isuzu Trooper Turbo Diesel
No mercedes (for now)
(02-05-2011, 10:29 PM)W116Lorinser diesel engines require a higher weight oil and a minimum of 5w-40 weight. if you put the 0w-40 you will probably ruin the engine.
Do you have some citation or evidence of this? 5w30 is the oil factory recommended by Mercedes for cold climates (//edit: 5w30 synthetic is factory approved for the OM617a for all temperatures, non-synthetic for temps below -5C). A 0w40 is thicker than 5w30 when warm, and only thinner when cold- where it will provide faster cold cranking and quicker oil circulation. Even a 0w40 is thicker when cold than a straight 50w is when hot- and thicker than the engine requires for optimal lubrication.
I suspect that the idea of higher viscosity oils providing superior lubrication or protection is a myth, especially given the properties of modern synthetic oil which have more stable viscosity at high temperatures. It probably originates from experience with ancient single viscosity non-synthetic oil in engines with very worn bearings, or extremely old engine designs machined to loose tolerances, whereby the bearing clearances were such that the engine essentially lost oil pressure at warm idle, causing rapid engine destruction. This could be mis-interpreted as failure of the oil to lubricate, when in fact the part(s) that failed were running without oil.
Thick oils like 15w40 offer enormous disadvantages:
1) Slower cranking and a significantly higher minimum temperature at which the engine can start
2) Increased engine wear on cold start due to longer time to achieve full oil pressure
3) Decreased fuel economy
4) Decreased oil flow volume (more oil returned by relief valve due to unnecessarily high pressures)
-Tyler
1984 Volvo 760GLE Turbo Diesel D24T/M46
1986 Isuzu Trooper Turbo Diesel
No mercedes (for now)
(02-04-2011, 10:21 PM)casioqv If I could buy it locally, I'd probably use Lubro Moly Synthoil Energy 0W-40 in MB and VW diesels. There seems to be some question over weather Mobil 1 is still made from group IV synthetic base stocks or not, whereas Lubro Moly (and Amsoil) are explicit about which base stocks they use. The Synthoil Premium 5 W-40 isn't really synthetic (group III).
http://www.liqui-moly.de/liquimoly/produ..._2050.html
There was a long thread on pp or bw about users on a vw forum all reporting Bad Things ™ from using 0w40.
1987 300D Sturmmachine
1991 300D Nearly Perfect
1985 300D Weekend/Camping/Dog car
1974 L508D Motoroam Monarch "NightMare"
OBK #42
(02-04-2011, 10:21 PM)casioqv If I could buy it locally, I'd probably use Lubro Moly Synthoil Energy 0W-40 in MB and VW diesels. There seems to be some question over weather Mobil 1 is still made from group IV synthetic base stocks or not, whereas Lubro Moly (and Amsoil) are explicit about which base stocks they use. The Synthoil Premium 5 W-40 isn't really synthetic (group III).
http://www.liqui-moly.de/liquimoly/produ..._2050.html
There was a long thread on pp or bw about users on a vw forum all reporting Bad Things ™ from using 0w40.
1987 300D Sturmmachine
1991 300D Nearly Perfect
1985 300D Weekend/Camping/Dog car
1974 L508D Motoroam Monarch "NightMare"
OBK #42
Thick oils like 15w40 offer enormous disadvantages:
1) Slower cranking and a significantly higher minimum temperature at which the engine can start
2) Increased engine wear on cold start due to longer time to achieve full oil pressure
3) Decreased fuel economy
4) Decreased oil flow volume (more oil returned by relief valve due to unnecessarily high pressures)
[/quote]
15w-40 is recommended oil for every tractor trailer/18 wheeler on the road and those are in engines costing over $100,000, there is a reason for this. yes 15-40 has disadvantages in cold weather and theres no doubt about that because i have experienced slightly more diffucult engine cranking in the colder winter months vs summer.
mobil 1 has a 5w-40 syntetic turbo diesel forumula that has been out for some time now. i will give that a try on my next oil change.
W116Lorinser
02-08-2011, 05:27 PM #10
Thick oils like 15w40 offer enormous disadvantages:
1) Slower cranking and a significantly higher minimum temperature at which the engine can start
2) Increased engine wear on cold start due to longer time to achieve full oil pressure
3) Decreased fuel economy
4) Decreased oil flow volume (more oil returned by relief valve due to unnecessarily high pressures)
[/quote]
15w-40 is recommended oil for every tractor trailer/18 wheeler on the road and those are in engines costing over $100,000, there is a reason for this. yes 15-40 has disadvantages in cold weather and theres no doubt about that because i have experienced slightly more diffucult engine cranking in the colder winter months vs summer.
mobil 1 has a 5w-40 syntetic turbo diesel forumula that has been out for some time now. i will give that a try on my next oil change.
(02-08-2011, 05:27 PM)W116Lorinser 15w-40 is recommended oil for every tractor trailer/18 wheeler on the road and those are in engines costing over $100,000, there is a reason for this.
Yes- the reason is that it's the thinnest non-synthetic oil that will maintain sufficiently high idle oil pressure when those engines are HOT (say pulling into a rest stop after climbing a grade fully loaded in 120F heat). Those engines would suffer no ill effects on a 5w30 or 5w40 synthetic.
-Tyler
1984 Volvo 760GLE Turbo Diesel D24T/M46
1986 Isuzu Trooper Turbo Diesel
No mercedes (for now)
(02-08-2011, 05:27 PM)W116Lorinser 15w-40 is recommended oil for every tractor trailer/18 wheeler on the road and those are in engines costing over $100,000, there is a reason for this.
Yes- the reason is that it's the thinnest non-synthetic oil that will maintain sufficiently high idle oil pressure when those engines are HOT (say pulling into a rest stop after climbing a grade fully loaded in 120F heat). Those engines would suffer no ill effects on a 5w30 or 5w40 synthetic.
-Tyler
1984 Volvo 760GLE Turbo Diesel D24T/M46
1986 Isuzu Trooper Turbo Diesel
No mercedes (for now)
my car starts easier/quicker, sounds better and performs better, and it solved my slight stalling problem i had since its been very cold in the northeast and i guess the 15-40 didnt circulate fast enough when cold to get everything cranking quicker.
W116Lorinser
02-10-2011, 12:05 AM #12i switched to mobil 1 5w-40 turbo diesel full syntetic formula today as i needed an oil change. And all that i can say is that i wish i had changed earlier.
my car starts easier/quicker, sounds better and performs better, and it solved my slight stalling problem i had since its been very cold in the northeast and i guess the 15-40 didnt circulate fast enough when cold to get everything cranking quicker.
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