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Best oil for BMW E46 320d (M47D20) diesel engine

Recommended oil specifications for M47D20 engine:

• Viscosity: 5W-30 or 5W-40
• Quality Standard: ACEA C3 or BMW Longlife-04

Top oil recommendations:

• Castrol Edge 5W-30 with Titanium FST
• Mobil 1 ESP Formula 5W-30
• Liqui Moly Top Tec 4200 5W-30
• Total Quartz INEO MC3 5W-30
• Shell Helix Ultra ECT C3 5W-30

Oil change interval: Every 15,000 km or annually, whichever comes first.

Note: For diesel engines, it's crucial to use low SAPS (Sulphated Ash, Phosphorus, and Sulphur) oils to protect the diesel particulate filter.