Market evolution: Diesel engine parts (CN 840999) — 2015–2025

Introduction

This report examines the evolution of EU trade in parts suitable for use solely or principally with compression-ignition internal combustion piston engines (Customs code 840999) over the 2015–2025 period. This product category covers components for diesel and semi-diesel engines not elsewhere specified, falling under the broader machinery heading (CN 84) and specifically under engine parts (CN 8409). It corresponds to PRODCOM code 28.11.42.00 in the European industrial classification.

The EU is a major global player in this sector, with EU-27 exports reaching €8.36 billion in 2025 and imports at €3.96 billion. Over the decade under review, the European diesel engine parts market has undergone a structural transformation shaped by the energy transition, evolving emission regulations, shifting global supply chains, and changing demand patterns across traditional and emerging markets. This report identifies three major dynamics that define this evolution.

1. Rising values, falling volumes: the European industry's pivot toward high-value production

Export values grew substantially while physical volumes contracted

Between 2015 and 2025, the EU's export value for diesel engine parts grew by 25.3%, rising from €6.68 billion to €8.36 billion. Over the same period, however, export volumes declined by 12.4%, falling from 484,791 tonnes to 424,817 tonnes. This divergence is captured clearly in the unit price, which rose by 42.9% — from €13,775 per tonne to €19,689 per tonne.

This pattern points to a deliberate repositioning of EU manufacturing toward higher-complexity, higher-value components. As the diesel engine market matures globally and faces regulatory headwinds from decarbonisation policies, European producers appear to be shedding commodity-grade production in favour of specialised, precision-engineered parts that command premium pricing.

EU production grew in value, supporting the premiumisation thesis

EU domestic production of diesel engine parts increased by 20.4% in value over the period — from €9.14 billion to €11.0 billion — confirming that the industry is not simply relocating capacity but rather shifting its product mix. At its peak, production reached an estimated €15.0 billion. Germany, the EU's leading producer with a revealed comparative advantage (RCA) of 1.82, accounts for nearly 39% of EU production in this segment, followed by Poland (RCA 1.68, 11% of production).

Import prices rose more modestly, reflecting a different product mix

On the import side, unit prices increased by 16.3% (from €10,445 to €12,149 per tonne) — roughly one-third the rate observed for exports. The import price gap between imports and exports widened from approximately €3,300 per tonne in 2015 to over €7,500 per tonne in 2025, reinforcing the interpretation that the EU increasingly imports lower-value parts while exporting premium components.

2. Shifting trade geography: the rise of China, the resilience of Türkiye, and the reshaping of traditional partnerships

China's import share surged dramatically

The most striking geographic shift on the import side was the 171.6% increase in imports from China, rising from €264 million in 2015 to €717 million in 2025. China's peak year was 2022, when imports reached €768 million. This explosive growth reflects China's emergence as a major producer of diesel engine components, likely driven by its massive domestic truck and industrial equipment market and significant cost advantages in manufacturing.

Türkiye consolidated its position as the EU's top import source

Türkiye remained the EU's single largest supplier throughout the period, growing from €820 million to €1.01 billion (+23.7%). The Türkiye–EU relationship in this sector is notably bidirectional: while the EU imported €1.01 billion from Türkiye, it also exported €692 million to Türkiye (+64.4%). This two-way trade reflects deep supply-chain integration, with Turkish factories serving both as subcontractors for European OEMs and as producers serving their own domestic automotive sector (which relies on EU-origin technology).

Traditional partners experienced relative decline

The United Kingdom — historically a major bilateral partner — saw its import share decline by 17.2% (€547M → €453M). This likely reflects post-Brexit trade friction and the relocation of some supply chains. South Korea's imports fell by an even steeper 41.5% (€331M → €194M), suggesting that Korean engine manufacturers may have internalised more of their component supply or shifted sourcing to closer Asian suppliers.

On the export side, the United States remained the EU's top destination, growing by 27.9% to €1.79 billion. Brazil (+49.7%) and India (+48.8%) emerged as high-growth export markets, likely reflecting the continued reliance of these economies on diesel power for commercial vehicles, agriculture, and construction equipment.

Germany dominated EU trade flows, while emerging EU members gained ground

At the Member State level, Germany accounted for €3.73 billion of the EU's €8.36 billion exports (45%) and €1.61 billion of its €3.96 billion imports (41%). Notable growth was recorded by Hungary (+115.3% in exports) and the Netherlands (+65.9%), reflecting the expansion of engine component manufacturing capacity in Central and Eastern Europe and the Netherlands' role as a logistics hub.

3. Growing self-sufficiency and deepening global integration: a structural transformation

The EU shifted from moderate to strong net exporter status

The EU's net import reliance shifted dramatically over the period — from −15.8% in 2015 to −64.6% in 2025 (a negative value indicates a trade surplus). This means the EU's trade surplus in diesel engine parts grew by 310% in relative terms, reaching €4.41 billion in 2025. The surplus expanded not because imports collapsed (they were essentially flat at +2.5%) but because exports grew much faster (+25.3%).

Trade intensity and export propensity surged

Two indicators confirm the sector's deepening global integration. Trade intensity (total trade as a share of production) nearly doubled from 43.0% to 82.1%. Export propensity (exports as a share of production) more than doubled from 32.3% to 75.5%.

This indicates that the EU diesel engine parts industry has become significantly more export-oriented over the decade. While the domestic EU market for diesel vehicles has been contracting under regulatory pressure, global demand — particularly in emerging markets and for heavy-duty, off-highway, and marine applications where diesel remains dominant — has sustained production volumes and driven export growth.

Import sourcing became more concentrated, while export markets remained diversified

The Herfindahl-Hirschman Index (HHI) for imports increased by 22.9% (from 1,095 to 1,346 in value terms and from 968 to 1,353 in volume terms), indicating growing concentration of import sourcing. This is largely driven by China's rise and the relative decline of Korean and UK suppliers.

By contrast, the export HHI remained relatively stable at around 985 (value), suggesting that EU exporters have maintained a diversified customer base across multiple geographies — a positive sign for resilience.

Volatility patterns reveal supply-chain risks and pricing anomalies

Volatility analysis of bilateral trade flows reveals that the most volatile partnerships are often geographically distant or geopolitically sensitive. EU exports to China showed the highest coefficient of variation (CV) among major partners at 0.48, followed by exports to Russia (0.65) and Canada (1.00). On the import side, the UK (CV 0.32) and China (CV 0.32) showed the highest variability among top suppliers.

Notable price shocks were detected in three cases:

• EU exports to Mexico (2022): An abnormal price spike of 121.5% above trend, with a 48.7% year-on-year shift. This coincides with post-pandemic supply-chain disruptions and may reflect opportunistic pricing or a shift in product mix toward higher-value components.
• EU exports to Japan (2023): A 30.7% price increase with a 12.4 abnormality score, possibly linked to yen depreciation making EU parts more expensive in local terms.
• EU imports from South Africa (2017): A 39.8% price jump with a 10.9 abnormality score, potentially reflecting currency effects or supply disruptions from South African mining-linked industrial production.

Conclusion

Over the 2015–2025 period, the EU's diesel engine parts sector (CN 840999) has undergone a profound structural transformation. The headline story is one of value growth outpacing volume decline — the European industry has moved up the value chain, producing fewer tonnes but earning significantly more per unit. This premiumisation strategy has been accompanied by a dramatic shift in trade geography, with China emerging as a major import source (+171.6%) while traditional partners like the UK and South Korea have receded. Meanwhile, the EU's trade surplus has expanded substantially, with the bloc achieving a €4.41 billion net export position in 2025.

The data also reveals a sector that has become deeply integrated into global markets: export propensity more than doubled from 32% to 76%, meaning that three-quarters of EU production now goes to non-EU buyers. This outward orientation has been sustained by strong demand from the United States, Brazil, India, and Türkiye — markets where diesel technology retains a significant role in transportation, agriculture, and industry.

Looking ahead, the central tension for this sector will be between the continued global demand for diesel power (particularly in heavy-duty and industrial applications where electrification alternatives remain limited) and the accelerating regulatory and market shift toward zero-emission powertrains within the EU. The current data suggests that European manufacturers are already adapting — focusing on higher-value, more specialised components while ceding commodity production to lower-cost competitors. Whether this strategy proves sustainable will depend on the pace of the global energy transition and the ability of EU firms to leverage their diesel expertise in adjacent technologies such as hydrogen engines and hybrid systems.