Second OCI after purchase. First OCI can be found here.
This was supposed to be a short OCI. Yeah. Did not work out quite so well. Nearly 15 months and roughly 18,500km/11,500 miles.
The numbers:
OIL Mobil1 0w-40 FS
MILES IN USE 11545 (18576km), ~15 months
MILES 156659 (252065km)
SAMPLE TAKEN 01/25/20 (date format for the civilized part of the world: 25.01.2020)
FILTER: SAAB M94-V6 4502696 (pictures to follow)
wear metals (mg/kg)
IRON 26
CHROME 2
TIN 0
ALUMINUM 3
NICKEL 0
COPPER 8
LEAD 0
MANGANESE 0
pq-index
pollution (mg/kg)
SILICON 10
POTASSIUM 0
SODIUM 6
WATER (%) IR-GLYKOL negative
FUEL (%) 0,9
Additives (mg/kg)
CALCIUM 3111
MAGNESIUM 23
BORON 152
ZINC 1089
PHOSPHORUS 877
BARIUM 0
MOLYBDENUM 79
SULPHUR 2111
state of oil:
visc. @40°C (mm2/s) 79.58
visc. @100°C (mm2/s) 13.78
VI 179
OXYDATION (A/cm) 12
NITRATION (A/cm) 7
SULFATION (A/cm) 2
Dispergency* (%) 90
SOOT INDEX** 0.2
TBN: 8.79
* the german word was "Schmutztragevermögen", hope I translated that right. **
the lab has introduced the "Rußindex", an in-house tool to check for soot in gasoline oil, as soot from direct-injection engines will not show correctly in the standard test for diesel oils
Wear metals didn't change, even though the distanceand time was greatly increased. The oil itselfdoes not only have more additives, it also seems to have held up better than the Shell HX7 that was in there in the previous OCI. After all, oxydation and nitration are not worse even after a greatly extended OCI, and sulfation is much lower. However, the previously used Shell was at a disadvantage: During the M1's OCI, I had the valve cover gaskets redone. This seems to have brought down water/moisture. Also, the car got a new exhaust, and probably because of that, fuel dilution was also lower, even though the driving profile did not change much. I have the impression that this might have helped a bit with chemical stability.
Also, I have the impression that this engine is slowly clearing out. The previous owners had severely short tripped the car, combined with less than ideal oil change intervals (quite conservative by milage, rather outrageous by time).
The car is now reacting much livelier to throttle input, oil consumption is reduced, and fuel efficiency has improved. I am inclined to believe that the rings are now freed up, but the fuel efficiency improvement might be influenced also by driver input, as 1) both of us got to know the car better and 2) wife has now much more driving experience (this is her first car!)
So, what does this tell us? Probably to keep your house in order. Fix small issues before they become big. If the engine is running in perfect condition, oil will age slower. Also, the C25XE (GM 54°V6) seems not to be too hard on oil. And M1 FS also looks like a great oil.
Blog post (german): https://turboseize.wordpress.com/20...w-40-fs-nach-18576km-im-saab-b258-opel-c25xe/
This was supposed to be a short OCI. Yeah. Did not work out quite so well. Nearly 15 months and roughly 18,500km/11,500 miles.
The numbers:
OIL Mobil1 0w-40 FS
MILES IN USE 11545 (18576km), ~15 months
MILES 156659 (252065km)
SAMPLE TAKEN 01/25/20 (date format for the civilized part of the world: 25.01.2020)
FILTER: SAAB M94-V6 4502696 (pictures to follow)
wear metals (mg/kg)
IRON 26
CHROME 2
TIN 0
ALUMINUM 3
NICKEL 0
COPPER 8
LEAD 0
MANGANESE 0
pq-index
pollution (mg/kg)
SILICON 10
POTASSIUM 0
SODIUM 6
WATER (%) IR-GLYKOL negative
FUEL (%) 0,9
Additives (mg/kg)
CALCIUM 3111
MAGNESIUM 23
BORON 152
ZINC 1089
PHOSPHORUS 877
BARIUM 0
MOLYBDENUM 79
SULPHUR 2111
state of oil:
visc. @40°C (mm2/s) 79.58
visc. @100°C (mm2/s) 13.78
VI 179
OXYDATION (A/cm) 12
NITRATION (A/cm) 7
SULFATION (A/cm) 2
Dispergency* (%) 90
SOOT INDEX** 0.2
TBN: 8.79
* the german word was "Schmutztragevermögen", hope I translated that right. **
the lab has introduced the "Rußindex", an in-house tool to check for soot in gasoline oil, as soot from direct-injection engines will not show correctly in the standard test for diesel oils
Wear metals didn't change, even though the distanceand time was greatly increased. The oil itselfdoes not only have more additives, it also seems to have held up better than the Shell HX7 that was in there in the previous OCI. After all, oxydation and nitration are not worse even after a greatly extended OCI, and sulfation is much lower. However, the previously used Shell was at a disadvantage: During the M1's OCI, I had the valve cover gaskets redone. This seems to have brought down water/moisture. Also, the car got a new exhaust, and probably because of that, fuel dilution was also lower, even though the driving profile did not change much. I have the impression that this might have helped a bit with chemical stability.
Also, I have the impression that this engine is slowly clearing out. The previous owners had severely short tripped the car, combined with less than ideal oil change intervals (quite conservative by milage, rather outrageous by time).
The car is now reacting much livelier to throttle input, oil consumption is reduced, and fuel efficiency has improved. I am inclined to believe that the rings are now freed up, but the fuel efficiency improvement might be influenced also by driver input, as 1) both of us got to know the car better and 2) wife has now much more driving experience (this is her first car!)
So, what does this tell us? Probably to keep your house in order. Fix small issues before they become big. If the engine is running in perfect condition, oil will age slower. Also, the C25XE (GM 54°V6) seems not to be too hard on oil. And M1 FS also looks like a great oil.
Blog post (german): https://turboseize.wordpress.com/20...w-40-fs-nach-18576km-im-saab-b258-opel-c25xe/
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