Warranty Considerations: OEM vs Aftermarket Coverage

Warranty Considerations: OEM vs Aftermarket Coverage for Commercial Vehicles Warranty is one of the most misunderstood aspects of commercial vehicle fleet management. The most common misconception—shared by many fleet managers and even some workshop advisors—is that using any non-OEM part automatically voids the vehicle manufacturer's warranty. This belief is factually incorrect under EU law, and acting on it costs fleets tens of thousands of euros per year in unnecessarily expensive OEM parts during the warranty period. This guide explains the actual legal framework governing vehicle warranty in the EU, sets out manufacturer-specific warranty terms, explains the coverage provided by quality aftermarket parts, and outlines the practical steps to protect your warranty rights whatever parts you choose. Table of Contents 1. EU Legal Framework: What the Law Actually Says 2. Block Exemption Regulation 461/2010 in Detail 3. How Each Major Manufacturer Handles This 4. OEM Warranty Terms and Extended Warranty 5. Aftermarket Part Warranties 6. Protecting Your Warranty Rights in Practice 7. Warranty Claim Procedures FAQ 1. EU Legal Framework: What the Law Actually Says European warranty rights for fleet operators rest on two main legal instruments: EU Directive 2019/771 (Sale of Goods) This directive establishes minimum guarantees for commercial goods purchased within the EU. For vehicles and parts, it provides a minimum 2-year guarantee against defects. Importantly, it makes clear that manufacturers cannot impose conditions on warranty coverage that restrict the consumer's free choice of aftermarket services or parts without specific justification. EU Regulation 461/2010 (Motor Vehicle Block Exemption Regulation) This is the central regulation governing the vehicle aftermarket in Europe. It explicitly prohibits vehicle manufacturers from tying warranty coverage exclusively to the use of their own branded parts or their authorised dealer network's services. The key protection for fleet operators: a vehicle warranty claim can only be denied if the manufacturer can prove that the aftermarket part used directly caused the specific failure for which the claim is made. This is a high evidentiary bar. If an aftermarket oil filter was used and the truck develops a brake system fault, the warranty claim on the brake system cannot be denied on the basis of the oil filter. 2. Block Exemption Regulation 461/2010 in Detail Understanding exactly what the Block Exemption Regulation (BER) prohibits helps fleet managers assert their rights confidently: What the BER Prohibits Tying maintenance to dealer network: Manufacturers cannot require that routine maintenance be performed exclusively at authorised dealers to maintain warranty. Any competent, qualified workshop can perform warranty-preserving maintenance. Parts exclusivity in warranty terms: Warranty terms cannot state that only OEM parts may be used. Such terms are null and void under EU competition law. Presumption of causation: Warranty cannot be denied based on the mere presence of an aftermarket part. The manufacturer must establish that the specific aftermarket part caused the specific failure. Information access restrictions: Manufacturers must provide independent workshops with access to technical repair and maintenance information on the same basis as authorised dealers. This supports the right to independent servicing. What the BER Does NOT Prohibit Manufacturers may require OEM parts for extended warranty programs (beyond the standard warranty period) as a condition of those specific programs Manufacturers may recommend OEM parts without making them mandatory Manufacturers may void warranty on specific components if they can prove the aftermarket substitute directly caused damage to those specific components Extended warranty contracts (paid-for contract extensions) may legitimately include OEM-only parts requirements 3. How Each Major Manufacturer Handles This Despite the clear EU legal framework, manufacturers vary in how they communicate and enforce their warranty positions in practice: MAN Truck & Bus MAN's warranty documentation generally aligns with EU regulations. They prefer OEM parts during the warranty period and MAN dealers may emphasise this, but they do not have a formal blanket exclusion for aftermarket parts. Maintenance records from any qualified workshop are accepted for warranty purposes. Mercedes-Benz Trucks MB Trucks is generally more assertive about preferring authorised dealers and MB-branded parts during the warranty period. For standard warranty claims, they are bound by EU law. For their extended "ePlan" warranty programs, MB parts are contractually required as a condition of the program. Scania Scania recommends Scania-branded parts and their dealer network but does not formally exclude aftermarket alternatives for standard warranty purposes. Their R&M (Repair and Maintenance) contracts typically specify Scania parts. Volvo Trucks Similar to Scania. Standard warranty is EU-law compliant regarding aftermarket parts. The "Gold" extended warranty program requires Volvo parts and dealer service as a contractual condition. DAF DAF's warranty terms are generally considered among the most straightforward regarding aftermarket compatibility. Their standard warranty does not have broad aftermarket exclusions, and many independent workshops are formally approved for DAF warranty repairs. 2. Block Exemption Regulation (Regulation 461/2010) The Motor Vehicle Block Exemption Regulation explicitly prohibits manufacturers from: Requiring fleet operators to use only OEM parts to maintain warranty Voiding warranty solely because aftermarket parts were used Refusing warranty claims without proving the aftermarket part caused the specific failure The key principle: the manufacturer must prove causation . If an aftermarket oil filter is used and the truck's steering fails, the warranty claim for the steering cannot be denied on the basis of the oil filter. 3. OEM Warranty Terms Typical Commercial Vehicle Warranty Manufacturer Standard Warranty Extended Options Aftermarket Parts Position MAN 2 years / 300,000 km Up to 5 years OEM parts preferred but not exclusive Mercedes-Benz 2 years / 250,000 km ePlan up to 4 years MB parts required for extended warranty Scania 2 years Up to 5 years Scania parts preferred for R&M contracts Volvo 2 years Up to 5 years via Gold service Volvo parts for extended/Gold contracts 4. Aftermarket Part Warranties Premium aftermarket parts from reputable manufacturers carry their own warranty coverage: MANN+HUMMEL filters: 24-month warranty when installed correctly LuK clutch kits: 24 months / 200,000 km (whichever is first) Bosch alternators: 24 months from date of installation Knorr-Bremse aftermarket parts: 24 months per product specification Warranty Conditions Aftermarket warranties typically require: Installation by a qualified workshop Correct application (part fitted to the correct vehicle) Proof of purchase from an authorised distributor No modification of the part 6. Protecting Your Warranty Rights in Practice Knowing your rights is one thing; being able to exercise them is another. These practical steps protect your warranty position when using aftermarket parts: Documentation is Everything The single most important step in warranty protection is maintaining a complete and accurate paper trail. Retain and organise: Service records: Workshop job cards for every service, including the date, odometer reading, parts fitted (with part numbers), and technician sign-off. These should be stored digitally and backed up. Parts invoices: Keep original purchase invoices for all parts used. These link the part to the date of installation and the purchasing supplier. Certificates of Conformity: For major aftermarket components, obtain a Certificate of Conformity from your supplier confirming the part meets relevant standards. Bay.Parts provides these on request. Failed parts retention: Do not dispose of any failed component until the warranty claim is resolved. The physical part is often required for the manufacturer's failure analysis. Use Qualified Workshops Even with the BER protecting your right to use any competent independent workshop, "competent" matters. Use workshops with qualified technicians (e.g., City & Guilds Level 3, or national equivalent) and professional diagnostic equipment. Independent workshops with manufacturer-approved technician training are preferable and increasingly common. Know When OEM Parts Are Genuinely Required If your trucks are covered by an extended warranty or R&M contract, read the terms carefully. These programs often legitimately require OEM parts as a contractual condition of the extended coverage. Calculate whether the warranty program's cost benefit justifies the additional parts cost versus using premium aftermarket across the fleet. 7. Warranty Claim Procedures For Vehicle Manufacturer Warranty Claims Document all maintenance performed using certified workshop records with dates, mileage, and parts fitted Retain all used/failed parts — do not dispose of any failed components until the claim is resolved Report the failure to an authorised dealer within the warranty period — in most cases, the vehicle must be inspected by the manufacturer's network Provide proof of correct maintenance intervals and parts used If a claim is denied citing aftermarket parts, request the specific causation evidence from the manufacturer — under EU law, they must provide this If you believe a claim has been wrongfully denied, contact your national automotive association or a transport industry legal advisor For Aftermarket Part Warranty Claims (through Bay.Parts) Contact your Bay.Parts account manager with the original invoice and failed part Provide the part serial/batch number and confirmed installation date Submit a failure analysis report from the installing workshop, including observations and any diagnostic output Bay.Parts coordinates directly with the manufacturer for failure assessment, replacement, or credit For major components (alternators, clutches, etc.), manufacturer technical representatives may request the failed part for analysis Frequently Asked Questions Q: Can my truck manufacturer void warranty if I use MANN oil filters? A: No. Under EU Block Exemption Regulation 461/2010, they would need to prove that the MANN filter specifically caused the failure they are refusing to cover. For a major quality brand like MANN+HUMMEL (who are themselves an OEM filter supplier to truck manufacturers), establishing this causation is essentially impossible. Keep your purchase invoice and service records to support your position if challenged. Q: What should I keep to protect my warranty rights? A: Retain: all service records with dates and odometer readings, invoices for all parts used (with part numbers and supplier), Certificates of Conformity for significant aftermarket parts, workshop job cards for every service, and the original failed component for any claim. A fleet management system that digitally records all of this data is a significant advantage. Q: Does the aftermarket warranty match OEM warranty coverage? A: The duration is often similar—24 months for major aftermarket brands versus the vehicle's 2-year OEM warranty. However, the scope differs: OEM warranty covers the entire vehicle against manufacturing defects; aftermarket warranty covers only the specific part against manufacturing defects in that part. Both are valuable but they address different failure scenarios. Together, a well-maintained vehicle with quality aftermarket parts is protected by both the vehicle warranty and the individual part warranties simultaneously. Q: What happens if my truck is in a country where it was not purchased when a warranty issue arises? A: For major manufacturers (MAN, Scania, Volvo, Mercedes, DAF), European-wide warranty coverage through the authorised dealer network is standard. Report the failure to any authorised dealer in the country of breakdown; they can access the vehicle's warranty status and coordinate the repair. Keep digital copies of all warranty documentation accessible to drivers during international operations.