I have read your forum with interest. Can somebody amongst you oil experts tell me if the aluminum & silica levels are high for a vehicle in the country/rural area that spends 1/3 of it's time on dirt roads. The operating temp range has been between -10C~+52C during this last service period. The air filter is a double oil foam filter as the paper filters only last 10000km out here.

Does anybody have the anaylsis/composition of new De**ac 1?

Thanks,
Mike

DATE SAMPLED 24/09/06
VEHICLE 2005 Nissan Navara 3.0lt turbo diesel
OIL Mobil De**ac 1
OIL GRADE 5W -40
OIL ADDED 0
FILTER changed
System Capacity: 6.8lts
Total kms: 40354
This oil sample: 11000kms

- Metals (ppm)
Aluminium (Al) 13
Copper (Cu) 4
Chromium (Cr) 1
Iron (Fe) 90
Lead (Pb) 3
Tin (Sn) 2
- Contaminants / Additives (ppm)
Silicon (Si) 19
Sodium (Na) <1
- Physical Tests
Water (% by FTIR) <0.1
Viscosity (cSt,100°C) 13
Soot % 0.4
PQ Index 12
Fuel % 1

Your Si & Al levels are not high at all for 11000km on this oil.
Do you know why you have 1% fuel in the oil? I would be more concerned about that.

Thanks Mr Hughes for your reply.
Re the fuel %, my only thought was in the last few weeks the vehicle has only done very short trips?? & any unburnt fuel from starting would not have been evaporated due to oil temp not reaching proper temp. Do you know the composition of De**ac 1?
Thanks.
(Why does this website keep changing the spelling of DE**AC)??

No idea why the webpage keeps additng stars in De**ac. Probably a filter or something.
Anyhow, the composition of De**ac 1 (5w-40) is:
Mobil De**ac 1 (5w-40)
Visc100 14,4 cst
Cu 0 ppm
Fe 0
Cr 0
Ni 0
Ti 0
Ag 0
Pb 0
Sn 0
Al 1
Si 5
Na 0
K 2
Mo 0
B 65
Ba 0
Ca 2282
Mg 505
Mn 0
P 1186
Zn 1239

Source

Thanks