Oil Om617
Oil Om617
(02-03-2011, 10:51 AM)winmutt 5w40 Synthetic.
(02-03-2011, 10:51 AM)winmutt 5w40 Synthetic.
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...
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
In 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.
(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.
(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
(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
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)
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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.
(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.
i 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.