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Best Engine Oil for Audi A5 B8 2.0 TDI (170/190 hp)
The Audi A5 B8 (2007–2016) is among the most purposeful expressions of VW Group’s mid-size saloon and coupé platform — elegant proportions, precise steering, and an interior that sets the standard for its class. The 2.0 TDI diesel variants use two principal engine codes: CAHA (170 hp, 2008–2012) and CNHA (190 hp, 2013–2016 Ultra variant). Both are EA189-family common-rail diesels, both require VW 507 00, 5W-30 ACEA C3, and both carry the context of the Volkswagen emissions recall. Understanding what distinguishes these two engine generations, and how correct oil selection protects them, is fundamental to responsible A5 B8 TDI ownership.
Quick Answer: Recommended Oil
- Specification: VW 507 00 / ACEA C3, 5W-30 full synthetic
- Alternative: VW 504 00 5W-30 (if 507 00 unavailable — not preferred for DPF longevity)
- Oil capacity with filter: 5.0 litres
- Oil capacity without filter: approx. 4.5 litres
The EA189 2.0 TDI Engines
CAHA (170 hp) — The first-generation common-rail 2.0 TDI in the B8 range, fitted from 2008 to 2012. It produces 170 hp and 350 Nm and uses a timing belt at the front of the engine. Timing belt replacement is mandatory — on the CAHA, Audi specifies replacement at approximately 120,000 miles or 4 years. On a B8 with unknown history, this is the first question to resolve before purchase.
CNHA (190 hp) — The EA189 “Ultra” variant introduced in the 2013 facelift. Revised combustion and friction reduction produce 190 hp and 400 Nm with better fuel consumption. The CNHA switches to a timing chain, eliminating the belt replacement interval but introducing different long-term maintenance considerations. The CNHA also uses a higher-pressure common-rail fuel system and a more aggressive EGR calibration.
Both engines were subject to the Dieselgate software recall issued from 2015. The recall software update modifies the EGR and injection strategy to reduce real-world NOx, typically at a small cost in fuel consumption. The oil specification is unchanged by the recall.
Understanding VW 507 00
VW 507 00 is the mandatory specification for all VW Group TDI diesel engines equipped with a diesel particulate filter (DPF). It requires ACEA C3 chemistry — low sulphated ash, controlled phosphorus and sulphur — that limits the incombustible residue deposited in the DPF per kilometre of driving. Full-SAPS oils (like VW 502 00 for petrol engines) are incompatible with DPF-equipped TDIs; their elevated ash content loads the DPF prematurely. VW 504 00 is an alternative if 507 00 is genuinely unavailable, but VW 507 00 is preferred for extended DPF service.
Technical Specifications
| Specification | Value |
|---|---|
| Displacement | 1,968 cc |
| Layout | Inline-4, DOHC, turbodiesel |
| Engine codes | CAHA (170 hp) / CNHA (190 hp) |
| Power / Torque | 170 hp / 350 Nm — 190 hp / 400 Nm |
| Injection | Common-rail direct injection |
| Aftertreatment | DPF + EGR |
| Timing system | Belt (CAHA) / Chain (CNHA) |
| Oil capacity (with filter) | 5.0 L |
| Recommended viscosity | 5W-30 |
| VW specification | VW 507 00 |
| ACEA classification | C3 |
Oil Change Intervals
VW Group’s Longlife service system can extend intervals to 30,000 km — not appropriate for a B8 TDI of this age in UK conditions. 15,000 km or 12 months, whichever comes first, is the correct practical interval. For high-mileage examples (above 150,000 miles) or cars with evidence of deferred servicing, 10,000 km intervals are advisable. The CNHA’s more aggressive EGR strategy increases soot loading on the oil; conservative intervals help maintain DPF function and oil viscosity integrity.
Common Problems Related to Oil
EGR carbon deposits: The most reported maintenance issue on both CAHA and CNHA — carbon accumulates progressively on the EGR valve body and intake ports. Symptoms: rough warm idle, hesitation under light throttle, P0401/P0404 codes. Post-recall CNHA engines with higher EGR rates can show this earlier. Carbon cleaning at 100,000–120,000 km is standard maintenance. Correct VW 507 00 limits combustion by-product contribution to carbon formation.
DPF soot loading: Short-trip urban use prevents passive regeneration. A5 B8 owners using the car primarily for city driving should ensure monthly motorway runs of 30+ minutes to support regeneration.
CAHA timing belt: On pre-2013 examples, timing belt replacement history is the critical pre-purchase check. A failed belt causes catastrophic engine damage and is not economical to repair on most B8 values.
CNHA oil dilution: The 190 hp Ultra variant’s short-trip regeneration cycles can introduce fuel into the oil. Check oil level monthly and inspect for thinning — an elevated oil level on the dipstick without refilling indicates fuel dilution.
Conclusion
The Audi A5 B8 2.0 TDI is a refined diesel GT whose EA189 engine requires VW 507 00 5W-30 ACEA C3 without compromise. Verify timing belt history on CAHA examples before purchase; budget for EGR cleaning at 100,000+ km on post-recall CNHA variants. Correct oil at 15,000 km or 12 months keeps the DPF and EGR systems within their operating parameters and protects the engine through high mileage.
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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.