Oil consumption

Maximum oil consumption

Excessive Oil consumption in a NA engine.

Piston / Piston Rings
1

Worn Piston Oil rings.

All N52b25 prior to June 2010, have faulty pistons with mal-positioned oil drain holes plus low-tension oil rings which are designed for chamber high-lubrication. Click here to Read the SIB.
Cooling system
3

Malfunctioning cooling system causing the engine to run very hot and thus the oil to thin out

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Climate
3

Hot climate regions like middle-east

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Driving style
2

Short journeys

Frequent spirited drives
Valve seals
1

Worn Valve Stem Seals (Oil seeps into the combustion chamber, past the valve seals, and gets burned).

N52 exhaust valve seals prior to mid-2006.
Crankcase Ventilation System
1

Stuck open/close CCV system

CCV Diaphragm and/or CCV hoses
Low Oil quality
2

Oil incorrect grade and specifications

Very long oil service intervals
Severe oil pan leak
3

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N52 Oil Level

Oil level is checked at normal operating engine temperature (90C ~ 95C), after at least 25 continuous minutes of motorway driving for at least 20 kms, on a flat level surface (Alignment shop in preference)

For accurate results, let the engine idle for 3 minutes before taking measurements. Note also, that the hotter the engine oil, the greater the oil level. A 5°C temperature variation can alter oil level by 3 or 4 mm.

mm % Liters Liters Lost Setpoint IDrive Bar
75.00 125 1.25 0 Overfill SP 5
74.00 120 1.2 0.05
73.00 115 1.15 0.1
72.00 110 1.1 0.15
71.00 105 1.05 0.2
70.00 100 1 0 Max 5
69.00 95 0.95 0.05
68.00 90 0.9 0.1
67.00 85 0.85 0.15
66.00 80 0.8 0.2
65.00 75 0.75 0.25 4
64.00 70 0.7 0.3
63.00 65 0.65 0.35
62.00 60 0.6 0.4
61.00 55 0.55 0.45
60.00 50 0.5 0.5 Setpoint 3
59.00 45 0.45 0.55
58.00 40 0.4 0.6
57.00 35 0.35 0.65
56.00 30 0.3 0.7
55.00 25 0.25 0.75 2
54.00 20 0.2 0.8
53.00 15 0.15 0.85
52.00 10 0.1 0.9
51.00 5 0.05 0.95
50.00 0 0 1 MIN 1
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