Oil-
As an Amazon Associate, we may earn from qualifying purchases. This doesn't affect our recommendations — we only suggest oils that hold the exact OEM approval for your engine.
Best Engine Oil for Audi A4 B9 2.0 TDI (150/190 HP)
The Audi A4 B9 (2016 onwards) is one of the most refined executive saloons in the UK market, and its 2.0 TDI diesel has been the dominant powertrain choice. Unlike the transverse-mounted EA288 found in the Golf and Passat, the A4’s 2.0 TDI uses a longitudinal variant of the same engine family, mounted north-south in the engine bay to accommodate Audi’s quattro all-wheel-drive system. Engine codes DETA (150 HP) and DEUA (190 HP) identify the two power levels. The longitudinal orientation changes the engine’s physical packaging — different sump shape, different turbo routing, different exhaust manifold — but the fundamental oil requirements remain identical: VW 507 00, the low-SAPS specification that protects the DPF while providing diesel-grade protection. This guide covers the A4 B9 TDI’s specific requirements and how its longitudinal layout affects maintenance.
Quick Answer: Recommended Oil
For Audi A4 B9 2.0 TDI (150/190 HP):
- Recommended viscosity: SAE 5W-30 (alternative: 0W-30)
- Oil capacity: 5.0 litres with filter (4.7 L without)
- Required norms: ACEA C3, VW 507 00
Longitudinal Layout: What It Changes
The A4’s longitudinal engine mounting places the crankshaft running front-to-back rather than side-to-side. This is necessary for Audi’s longitudinal quattro system, where the front differential and propshaft to the rear axle exit from the back of the gearbox.
For oil, the longitudinal layout has several practical consequences:
Larger sump capacity. The A4’s 5.0-litre capacity with filter is 0.3 litres more than the Passat B8’s 4.7 litres. The longer, narrower sump shape required by the longitudinal layout provides marginally more oil volume, which helps with thermal management during sustained motorway use.
Different turbo positioning. The turbocharger sits at the rear of the engine (towards the firewall) rather than at the front. Oil feed and return lines are longer, and the turbo sits in the engine bay’s hottest zone. This makes oil coking in the turbo bearing housing more likely if the engine is switched off immediately after hard driving. A 30-60 second cool-down idle before shutdown is particularly important on the A4.
Timing belt accessibility. The timing belt sits at the front of the engine, facing forward. Access is easier than on transverse applications, which can reduce labour costs for belt replacement. The replacement interval is the same: 130,000 miles under LongLife service.
The DETA and DEUA: Two Calibrations
DETA (150 HP): 150 HP at 3,250-4,200 RPM with 340 Nm from 1,500-3,250 RPM. This is the standard A4 diesel, delivering relaxed motorway cruising with excellent fuel economy (typically 50-55 mpg in real-world driving). The single variable-geometry turbo provides smooth, predictable boost delivery.
DEUA (190 HP): 190 HP at 3,800-4,200 RPM with 400 Nm from 1,750-3,000 RPM. A revised turbo calibration, higher injection pressures, and modified fuel mapping deliver substantially more mid-range performance. The 190 HP variant is more commonly specified with quattro and the S tronic dual-clutch gearbox, creating a sporting executive car that happens to use diesel.
The 190 HP variant generates more heat through its higher combustion pressures and turbo loading. Oil temperatures can reach 120-130°C under sustained motorway driving, particularly in quattro variants where the additional drivetrain friction contributes thermal load. VW 507 00 oils are validated at these temperatures, but the 190 HP variant benefits most from premium synthetic formulations with exceptional thermal stability.
Audi Service Intervals and Warranty
Audi offers two service regimes:
LongLife service: Up to 18,600 miles (30,000 km) or 24 months, monitored by the onboard service indicator. This regime uses VW 507 00 oil and adjusts the interval based on driving conditions.
Fixed service: 9,300 miles (15,000 km) or 12 months. Available as an option and commonly used by owners who prefer shorter intervals.
The A4’s typical ownership — motorway-heavy business use — is relatively kind to oil. However, the LongLife interval is optimistic for mixed driving. Fixed-interval servicing at 9,000-10,000 miles provides a safety margin that protects the DPF and turbocharger at minimal additional cost.
Warranty consideration: Audi’s 3-year warranty and any extended warranty require documented use of VW 507 00-approved oil. Keep all service receipts showing the oil specification used. Independent specialists can service the A4 to Audi standards using approved oils without affecting warranty coverage, provided the service is documented.
Technical Specifications: 2.0 TDI EA288 (Longitudinal)
| Specification | Value |
|---|---|
| Displacement | 1,968cc (2.0 litres) |
| Layout | Inline-4, longitudinal, iron block, aluminium head |
| Valvetrain | DOHC, 16 valves |
| Timing System | Dry timing belt |
| Turbocharger | Variable-geometry (VNT) |
| Injection | Common-rail, up to 2,000 bar |
| Power | 150 HP (DETA) / 190 HP (DEUA) |
| Torque | 340 Nm (DETA) / 400 Nm (DEUA) |
| Emissions | Euro 6 — DPF + SCR (AdBlue) + EGR |
| Recommended Viscosity | SAE 5W-30 |
| Oil Capacity (without filter) | 4.7 litres |
| Oil Capacity (with filter) | 5.0 litres |
| ACEA Norm | C3 |
| VW Norm | VW 507 00 |
Best Value: Total Quartz INEO LongLife 5W-30 Reliable VW 507 00 protection at competitive pricing. At £32-38 for 5 litres.
Oil Change Intervals
Recommended Practice: 9,000-10,000 miles or 12 months.
Consider 8,000-mile intervals if:
- Predominantly urban driving
- 190 HP quattro variant under spirited driving
- Annual mileage under 10,000 (annual change regardless)
- Oil appears dark and thin before 10,000 miles
Conclusion
The Audi A4 B9 2.0 TDI requires SAE 5W-30 engine oil meeting ACEA C3 and VW 507 00, with a capacity of 5.0 litres including the filter. The longitudinal layout differentiates it from transverse VW applications, with turbo positioning and sump design creating specific maintenance considerations.
Castrol EDGE Professional LL III 5W-30 is the factory partner’s choice. Allow a brief idle period before shutdown after motorway driving, use fixed-interval servicing, and the A4 B9 TDI will deliver the refined, economical long-distance motoring it was designed for.
Our Top Picks
As an Amazon Associate, we may earn from qualifying purchases. This doesn't affect our recommendations — we only suggest oils that hold the exact OEM approval for your engine.