I have a loss of engine oil in my Iveco Starlis

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I have Iveco Starlis Cursor 10, Euro 5.The loss of engine oil during change period ist too big.The used oil is Alpine Turbo Plus 10W 40 . We made oil analise.

Iveco Strail AT Cursor 10 430
Referentie machine LG107
Laboverslag
1 van 2
ILS Conditioning & Monitoring, Langerbruggekaai 18, B 9000 Gent
Commentaar
The sample contains traces just of water: 0.09 %.
There is no significant amount of fuel dilution observed.
The kinematic viscosity @100°C is with 15.22 mm²/s compliant with the mentioned SAE40 specification limit.
The base number is acceptable still (8.5 mgKOH/g), as is the insoluble content (0.52%).
Spectrometric data high levels of mostly Iron and Lead, suggesting abnormal mechanical or corrosive wear.
Make a preventive oil and filter change at your earliest convenience.
Monitor this engine closely.
26/02/2010 Hilde Lecluyse

G163
!!
Productnummer Alpine Turbo
Plus 10W-40
Staalname 8/02/2010
Ontvangstdatum 25/02/2010
Machine-uren 265000
Kleur > 7,5
[-] ASTM-D1500
Visueel aspect Clear
[-] Intern
Water (crackle test) 0,09
[% Volume] Intern
Kinematische Viscositeit @100°C 15,22
[mm²/s] ASTM-D445
Vlampunt (Seta) > 190
[°C] ASTM-D3828
Basegetal 8,5
[mg KOH/g] ASTM-D2896
Onoplosbaar 0,52
[% Gew.] Intern
Aluminium 22
[ppm] ASTM-D5185
Chroom 5
[ppm] ASTM-D5185
Koper 12
[ppm] ASTM-D5185
IJzer 109
[ppm] ASTM-D5185
Nikkel 1
[ppm] ASTM-D5185
Lood 106
[ppm] ASTM-D5185
Silicium 10
[ppm] ASTM-D5185

I need to understand why ?
 
Extremely high lead. if it has happened for more than one period, it is probably on the verge of catastrophic failure. That sample indicates very high bearing tolerances from wear, and probably running low oil pressure because of it. Might get some temporary relief from that wear by a thicker oil.

I don't see any words that look like Glycol, so I assume it either was not present or they did not check for it. That could cause high corrosion in the bearings, but not so much in the cylinders.

One sample only points to current problems and conditions. From the thousands I've seen, this looks like a case where there has been a lot of contamination in previous oil changes, causing very high wear, therefor more blow-by. 109 ppm of iron is indicative of high cylinder liner wear. If not from current contamination (and 10 ppm of silicon is at the limit, but not that bad) or an accumulation of carbon in and between the rings, like an engine I saw last week. Run a compression check.
 
Around here I've seen it at 50,000 km. What kind of air filter does it have? I've seen some Ivecos with an oil bath and very high wear metals.
 
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