1983 MB 300D turbodiesel - 6K on delvac 1

[JHZR2]

Here is my latest analysis. The oil used was delvac 1. I have done two other analyses on this engine as well, onewith a 50/50 mix of delvac 1 and delvac 1300, the oldest with 100% delvac 1, Isame as this newest one. Add up was about 1 qt due to leaks (pre-existing, not caused by use of synthetic oil).

A good thing to note is that the first two intervals had Fe wear at a rate of ~6ppm/1000 mi. This latest one, despite a longer OCI, and more soot loading, had only ~4.75ppm/1000mi. Perhaps the change to delvac 1 oil only has begun to help a bit (?)

All in all, the engine didnt load the oil with as much soot as Id have guessed. Ill probably keep the 6k mile OCI with this oil.

Sample Date 5/14/2004 7/11/2003 5/14/2003
Unit Age 224008m 203921m 200700m
Time on Fluid 6120m 3221m 3638m
Time on Filter 6120m 3221m 3638m
Fluid Maint. Changed Changed Changed
Filter Maint. Changed Changed Changed
Fluid Del.1 Del.1/1300mix Del.1
Iron (Fe) 29 19 22
Chromium (Cr) 1.1 0.6 0.7
Nickel (Ni) 1.6 1.2 1.4
Titanium (Ti) 0.0 0.1 0.1
Silver (Ag) 0.0 0.0 0.0
Aluminum (Al) 3.5 2.5 2.4
Lead (Pb) 4.1 4.1 4.3
Copper (Cu) 0.9 0.5 0.6
Tin (Sn) 0.7 0.0 0.0
Silicon (Si) 7.8 4.3 5.6
Sodium (Na) 0.0 2.3 2.3
Potassium (K) 15 6.7 2.2
Boron (B) 80 54 111
Barium (Ba) 0.0 0.0 0.0
Molybdenum (Mo) 7.7 26 11
Magnesium (Mg) 397 443 427
Calcium (Ca) 2340 2070 2096
Phosphorus (P) 1032 1034 1098
Zinc (Zn) 1185 1101 1176
Sulfur (S) 3514 4029 4192
Cadmium (Cd) 0.0 0.1 0.0
Manganese (Mn) 3.8 0.2 0.3
Vanadium (V) 0.0 0.0 0.0
Soot(%) 1 1.1 0.8 0.9
Oxidation(PA) 75 70 75
Nitratrion(PA) 55 35 45
Sulfation(PA) 20 23 13
ZDDP 0 9.53 0.00 0.00
Kv@100°C 15.45 14.9 14.77
White Metal NONE NONE NONE
Babbitt NONE NONE NONE
Precipitate NONE NONE NONE
Silt NONE NONE NONE
Debris NONE NONE NONE
Dirt NONE NONE NONE
Appearance NORML NORML NORML
Odor NORML NORML NORML
H2O(Emul) NEG NEG NEG
H2O(Free) NEG NEG NEG

[ May 27, 2004, 11:30 PM: Message edited by: JHZR2 ]

 

[TexasTDI]

Knowing the oil's TBN would greatly help you decide how long of an OCI you could use.

 

[JHZR2]

These engines will load up the soot before the TBN is depleted.

JMH

 

[TooSlick]

You have a fair amount of soot; given the # of miles on this sample ....

I'd recommend using an effective diesel fuel additive like Fuel Power, Primrose, Stanadyne, Amsoil diesel fuel concentrate, etc on a regular basis, or perhaps even biodiesel ie, B10 or B20 if you can find it. The oil is still in excellent shape and there is no reason why you shouldn't be able to run at least 10,000 mile, oil/filter change intervals with this engine/oil combo.

Tooslick
www.lubedealer.com/Dixie_Synthetics

 

[BigdaddyG]

I don't know much about the numbers but your 50/50 mix looks pretty good too. I was thinking of this because after longer highway trips the oil pressure at idle is a bit lower on my DuraMAx when I run Delvac-1 alone. Not in the danger zone mind you but kind of bothers me for some reason. I live in southern california so cold weather is usually not a problem for me. Any thoughts?