Hi,
Ted - thanks for your reply please note the following;
Use - This vehicle/engine has been in a "downgraded" task for the last three years and in the hands of my Senior Driver. During this time the vehicle has averaged 31kms per OCI of an averaged 13 months - see below under "Past History of this engine"
Detroit Diesel's recommended OCI is 10kkms for an engine in this application and we have tripled this using Delvac 1 and UOAs
Very little idling time is a factor in its use
Oil use - oil consumption has averaged 3000kms/litre, extremely good in this application
Oil viscosity - yes the oil did thicken but this is normal and well within Detroit/Mobil limits
Filters - This engine does NOT HAVE a MANN-HUMMEL centrifuge by-pass filter fitted The FF filters are Donaldson Extended Life Filters ( ELF3998) which are not changed during the OCI ( 13months, 31kkms )
Soot level - the soot level of 3.5 is nearing our upper limit of 3.9 but "normal"
Past History of this engine ( since 2000 ):
Col 1 = average at OCI ( three UOA's )
Col 2 = average of all ten UOA's
Col 3 = highest of all ten UOA's
Col 4 = lowest of all ten UOA's
Col 5 = last sample ( posted above in this thread )
Aluminium 3 - 2 - 3 - 2 - (2)
Chromium 6 - 5 - 6 - 4 - (6)
Iron 94 - 70 - 108 - 32 - (87)
Copper 4 - 3 - 5 - 2 - (4)
Lead 26 - 13 - 18 - 4 - (30)
Silicon 22 - 26 - 60 - 5 - (9)
Sodium 13 - 13 - 18 - 4 - (10)
Vis@40C 108 - 101 - 122 - 94 - (114)
Soot % 3.57 - 3.34 - 3.9 - 2.3 - (3.5)
TBN 3.4 - 4.63 - 6.60 - 3.1 - (3.4)
This early ( 1996 ) Detroit Series 60 DDEC3 engine and Delvac 1 has been an incredible COST EFFECTIVE combination. If a mineral oil had been used in this application it would have required oil and filter changes at about 10kkms or less
Sadly, this vehicle which is an "International S3600/Navistar/IVECO" is about to be disposed of as it is nearing 7 years old and my oldest, but it is my favourite!
Regards
Doug