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#1
11-17-2005, 02:53 PM
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Best oil level for a Diesel engine
What is the best oil level for a 27 years old 617.912 Diesel engine?
A friend of mine told me that it's best to keep it between middle level and 3/4, too much being bad on the oil pump/system. From my experience the engine sounds better when the oil level's between middle and full level but I want to know what would be the best/recommended level for this type of engine. Note that it doesn't use up any oil so I need to get it right once/oil change. 
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#2
11-17-2005, 02:57 PM
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General concensus is halfway between full and add mark...at full mark consumption increaces...and on the other side its never good to have it below the full mark. But realisticly anywhere between that is fine. Changing it regular and on time is far more important.
__________________
Proud owner of .... 1971 280SE W108 1979 300SD W116 1983 300D W123 1975 Ironhead Sportster chopper 1987 GMC 3/4 ton 4X4 Diesel 1989 Honda Civic (Heavily modified) --------------------- Section 609 MVAC Certified --------------------- "He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche
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#3
11-17-2005, 03:35 PM
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Strange problem I have, related to this.
Before I found this place, I used to fill up with 10W30 (I know, I know.. horrible to do that).. which would register perfectly on my dipstick. Now, when I use the same amount of Rotella-T, it registered at about the too-full line. Is this normal.. I assume it's not.. in which case.. what the heck would cause this?  Engine has no blow-by, and a small oil leak from the filter housing.
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#4
11-17-2005, 03:44 PM
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Quote:
Cheers, Bill
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#5
11-17-2005, 03:47 PM
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Quote:
__________________
Proud owner of .... 1971 280SE W108 1979 300SD W116 1983 300D W123 1975 Ironhead Sportster chopper 1987 GMC 3/4 ton 4X4 Diesel 1989 Honda Civic (Heavily modified) --------------------- Section 609 MVAC Certified --------------------- "He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche
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#6
11-17-2005, 04:27 PM
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The car is a 1984 300D Euro (with an aftermarket turbo). 7 quarts? Huh.. I usually put 7 1/2 in.
On a totally unrelated note.. what is the size of the fuel tank on this thing? 18 gal?
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#7
11-17-2005, 04:29 PM
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How were you buying your 10w-30 and for that matter your Rotella? You usually don't see Rotella in quart bottles, and you usually don't see 10w-30 in gallon bottles. If you use 8 quart bottles vs 2 gallon bottles, you will actually be delivering more oil into the engine from the 2 bottles vs the 8 bottles. If you let them drain long enough the difference is pretty small, but if you have 8 bottles to dump you are likely to get in a hurry and not let them drain quite long enough. Just a hypothesis, I'm probably full of crap...
__________________
Keep everything as simple as possible-but no simpler--Albert Einstein
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#8
11-17-2005, 09:12 PM
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Any chance one was quart bottles and the other liter bottles?
__________________
1991 GMC Sonoma Ext Cab w/Isuzu diesel (converted March Mar 2003) - sold 1994 S10 Ext Cab w/Isuzu diesel (converted Mar 2008) 1998 Toyota Sienna XLE B6100HST Kubota CUT DIESEL  1994 S10 with Isuzu diesel and 5spd http://img.photobucket.com/albums/v6...S15/SigPic.jpg
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#9
11-17-2005, 09:15 PM
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Quote:
__________________
Proud owner of .... 1971 280SE W108 1979 300SD W116 1983 300D W123 1975 Ironhead Sportster chopper 1987 GMC 3/4 ton 4X4 Diesel 1989 Honda Civic (Heavily modified) --------------------- Section 609 MVAC Certified --------------------- "He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche
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#10
11-17-2005, 10:33 PM
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According to MB between the low mark and high mark. Half way seems to be the best some engines will burn oil until it is down to the half way mark.
__________________
2016 Corvette Stingray 2LT 1969 280SE 2023 Ram 1500 2007 Tiara 3200
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#11
11-18-2005, 12:57 PM
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oil level
A higher viscosity oil may stay in all the crank/rod journals and other machine fits so may not drain back to the pan after shutdown. Just a guess.
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#12
11-18-2005, 01:12 PM
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For you 603 owners, I remember reading a post here, might even have been from Marshall Booth, or referenced such from, anyway the message for the 603 was to not fill to the full mark on the stick, but half-way between.....
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#13
03-07-2010, 02:29 PM
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Recycled
Quote:
Important NOTE: For the most accurate level reading; Check the engine oil COLD or 45 minutes after the engine is turned off. IMO; running half a quart below the full mark is the best balance.
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#14
03-07-2010, 02:53 PM
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FWIW, I find that the 617 uses the least oil when it's level is maintained just above the low mark.
In 5K, I can get away with about 1.5 quarts...........otherwise, if held above the middle of the range, it will use close to 3 quarts.
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#15
03-07-2010, 04:50 PM
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We are finding this out as well on our wagons 617.952. It almost seems as if the car quickly burns off the oil if it is filled to the top line when cold but as the level gets closer to the bottom line on the dipstick then it stays that way longer? Did they make a mistake when they marked the dipstick? It seems to me in one of the two cars the engine seems to run better with less than full oil....faster or more freewheeling like more oil equals more resistance in the crankcase? My 300d non turbo is this way as well. why?
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