OK gang, here's my latest UOA:
Car: 2004 Jetta GL (PD engine)
Miles on car at time of sample: 125445
Miles on oil sample: 14955
Oil: Mobil Delvac 1 5w40
Oil in service from April 8th, 2007 til August 14th, 2007
Fuel used: Sunoco#2 Diesel, plus 2 tankfuls of B-20 (Sunoco/Soylect blend)
4 ounces of Stanadyne Performance Formula were added at each fillup
Makeup oil added:400ml
Lab used: AV Lube/Predictive Maintenance Services
Iron:60
Chromium:2
Lead:4
Copper:5
Tin:0
Aluminum:9
Nickel:1
Silver:0
Silicon:6
Boron:24
Sodium:27
Potassium:9
Magnesium:423
Calcium:2527
Phosphorus:1181
Zinc:1337
Molybdenum:1
Fuel:A
Water: Glycol:N
Viscosity @ 100C:17.6 cst
Soot:0.8
Oxidation:17
Nitration:12.00
TBN:6.42
Notes: Values in bold font show significant changes from the previous UOA.
Soot exactly doubled (previous number was 0.4) and as a consequence, the oil thickened to nearly a 50 weight and TBN dropped a little. Sodium more than quadrupled (previous number was 6), so I must investigate the possibility of an EGR cooler leak or other problem. (yes the EGR cooler recall has already been performed). Iron rose very slightly (probably from the soot), but lead, copper and aluminum all dropped slightly. Chromium remained the same, and silver was unchanged. Silicon also dropped slightly, so air filtration continues to look good. I'm still using stock oil filtration (Mann filters).
The B-20 was run on two consecutive tankfuls, and barely into the second, the car began to run very poorly. Suspecting a clogged filter, I removed the filter and took a sample which was so dark that light would barely pass through it. I was able to siphon nearly all of the bad fuel out and replaced the filter and refilled the tank with with Shell #2 Diesel. The car ran normally immediately after doing this and has exhibited no problems since. Obviously, the solvency of the B-20 caused the problem since it effectively "cleaned out" my fuel system.
Just to try something different, I switched from the normal BP#2 Diesel to Sunoco. Exhaust soot increased significantly with this fuel.
Aside from the fuel issues, the engine continues to run well, and wear metals remain very good as shown here.
The engine now has over 75k on Delvac 1.
Car: 2004 Jetta GL (PD engine)
Miles on car at time of sample: 125445
Miles on oil sample: 14955
Oil: Mobil Delvac 1 5w40
Oil in service from April 8th, 2007 til August 14th, 2007
Fuel used: Sunoco#2 Diesel, plus 2 tankfuls of B-20 (Sunoco/Soylect blend)
4 ounces of Stanadyne Performance Formula were added at each fillup
Makeup oil added:400ml
Lab used: AV Lube/Predictive Maintenance Services
Iron:60
Chromium:2
Lead:4
Copper:5
Tin:0
Aluminum:9
Nickel:1
Silver:0
Silicon:6
Boron:24
Sodium:27
Potassium:9
Magnesium:423
Calcium:2527
Phosphorus:1181
Zinc:1337
Molybdenum:1
Fuel:A
Water: Glycol:N
Viscosity @ 100C:17.6 cst
Soot:0.8
Oxidation:17
Nitration:12.00
TBN:6.42
Notes: Values in bold font show significant changes from the previous UOA.
Soot exactly doubled (previous number was 0.4) and as a consequence, the oil thickened to nearly a 50 weight and TBN dropped a little. Sodium more than quadrupled (previous number was 6), so I must investigate the possibility of an EGR cooler leak or other problem. (yes the EGR cooler recall has already been performed). Iron rose very slightly (probably from the soot), but lead, copper and aluminum all dropped slightly. Chromium remained the same, and silver was unchanged. Silicon also dropped slightly, so air filtration continues to look good. I'm still using stock oil filtration (Mann filters).
The B-20 was run on two consecutive tankfuls, and barely into the second, the car began to run very poorly. Suspecting a clogged filter, I removed the filter and took a sample which was so dark that light would barely pass through it. I was able to siphon nearly all of the bad fuel out and replaced the filter and refilled the tank with with Shell #2 Diesel. The car ran normally immediately after doing this and has exhibited no problems since. Obviously, the solvency of the B-20 caused the problem since it effectively "cleaned out" my fuel system.
Just to try something different, I switched from the normal BP#2 Diesel to Sunoco. Exhaust soot increased significantly with this fuel.
Aside from the fuel issues, the engine continues to run well, and wear metals remain very good as shown here.
The engine now has over 75k on Delvac 1.
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