For many BYD DM-i owners, the first scheduled service is more than just an oil change—it's one of the most important milestones in maintaining eligibility for BYD's Lifetime Warranty Program on key electric vehicle components.

Many owners unknowingly make mistakes during the first service period, not because they intentionally ignore maintenance requirements, but because they misunderstand how BYD's warranty policies work. Missing a service deadline, misunderstanding HEV mileage requirements, or using the wrong service provider could potentially create issues when filing future warranty claims.

In this guide, we'll break down the seven most important first-service rules every BYD DM-i owner should understand, based on current maintenance requirements, dealership practices, and real-world owner experiences.

Whether you drive a BYD Qin Plus DM-i, Song Plus DM-i, Seal 06 DM-i, Destroyer 05, or Tang DM-i, these tips can help you maintain your vehicle properly while protecting your warranty coverage.

What Are BYD DM-i First Service Requirements?

Quick Answer

For most BYD DM-i models, the first service must be completed within:

• 6 months after vehicle delivery, or
• A specified HEV (Hybrid Electric Vehicle) mileage limit

Whichever comes first.

Typical requirements include:

One important detail that many new owners overlook is that BYD primarily tracks HEV mileage, not total vehicle mileage, when determining first-service eligibility.

Always verify the exact requirement in your owner's manual and warranty booklet, as service intervals may vary by model and market.

Why Is the First Service So Important?

Many drivers assume that BYD's Lifetime Warranty automatically remains valid for as long as they own the vehicle.

In reality, warranty coverage is tied to proper maintenance and compliance with manufacturer requirements.

When evaluating warranty claims involving critical components such as:

• High-voltage batteries
• Electric motors
• Electronic control systems

BYD may review factors including:

• Whether scheduled maintenance was completed on time
• Service history records
• Repair and maintenance locations
• Vehicle modification history
• Documentation supporting maintenance compliance

Because the first service establishes the beginning of your vehicle's maintenance record, it plays a particularly important role in future warranty evaluations.

1.Never Miss the First Service Deadline

The most common mistake among new owners is waiting too long to schedule their first service.

Many drivers assume that exceeding the service interval by a few days or a small amount of mileage won't matter. However, service schedules exist for a reason, and maintaining compliance is always the safest approach.

Instead of waiting until the last minute, schedule your appointment early.

Recommended Timing

Consider booking your first service when:

• You are 15–30 days away from the 6-month deadline, or

• You are within 300–500 km of the required HEV mileage limit

This buffer helps avoid scheduling delays during busy periods at dealerships.

2.Don't Rely Exclusively on EV Mode

One of the biggest advantages of BYD's DM-i system is its ability to operate as both an electric vehicle and a hybrid.

However, some owners use EV mode almost exclusively for daily commuting, resulting in the gasoline engine running very infrequently.

From a mechanical perspective, engines benefit from regular operation to maintain proper lubrication and system health.

Extended periods without engine use may contribute to:

• Moisture accumulation
• Fuel degradation
• Carbon deposits
• Incomplete engine break-in

Best Practice

To help maintain engine health:

• Use HEV mode periodically
• Allow the engine to operate during longer trips
• Avoid leaving the engine inactive for extended periods

A balanced mix of EV and HEV driving is generally recommended.

3.Use Authorized BYD Service Centers Only

If maintaining warranty eligibility is important to you, servicing your vehicle through BYD's authorized network is highly recommended.

For your first service, choose:

• An authorized BYD dealership
• An official BYD service center

After the service is completed, verify that all records have been properly documented.

Service Checklist

Make sure the following information is recorded:

✔ Service booklet stamped

✔ Service date entered correctly

✔ Total vehicle mileage recorded

✔ HEV mileage recorded

✔ Digital service records updated in BYD's system

Accurate records can be valuable if warranty questions arise in the future.

4.Understand What Is Included in the Free First Service

BYD's first service is typically provided as a complimentary maintenance benefit.

Commonly included services may include:

Some dealerships may recommend optional add-on services, but these are generally not required for warranty compliance.

Always ask for clarification before approving additional charges.

5.Follow Proper Break-In Driving Practices

Although modern engines are manufactured to extremely high standards, the initial break-in period still plays an important role in long-term performance.

For approximately the first 1,500 km, consider adopting moderate driving habits.

Recommended Driving Habits

✔ Smooth acceleration

✔ Moderate engine speeds

✔ Mixed EV and HEV operation

✔ Varying driving speeds

Driving Habits to Avoid

✘ Aggressive launches

✘ Hard acceleration and braking

✘ Sustained high-speed driving

✘ Overloading the vehicle

Proper break-in practices can contribute to improved efficiency and long-term reliability.

6.Avoid Major Modifications Before the First Service

Many EV enthusiasts enjoy personalizing their vehicles soon after delivery.

However, modifications involving key vehicle systems should be approached carefully.

Examples include:

• Powertrain software tuning
• Battery system modifications
• High-voltage electrical changes
• Motor controller modifications
• Non-approved software installations

Before making any significant changes, consult your local BYD service center regarding potential warranty implications.

7.Keep All Service Records for the Long Term

Many owners discard maintenance paperwork shortly after a service visit.

This can become problematic years later if warranty-related questions arise.

Documents Worth Keeping

Store both digital and physical copies of:

• Service invoices
• Maintenance work orders
• Warranty booklet records
• Service receipts
• Digital service confirmations

Maintaining a complete service history can make future warranty claims significantly easier to process.

The 5 Most Common First-Service Mistakes

Based on owner experiences, the following issues occur most frequently:

1. Confusing Total Mileage with HEV Mileage

Many owners mistakenly monitor total vehicle mileage instead of HEV mileage.

2. Waiting Until the Last Minute

Scheduling delays can create unnecessary stress.

3. Driving Almost Exclusively in EV Mode

Regular engine operation remains important for hybrid vehicles.

4. Failing to Verify Service Records

Always confirm that dealership records have been updated correctly.

5. Losing Maintenance Documents

Missing paperwork can complicate future warranty claims.

Frequently Asked Questions

1.Does BYD use total mileage or HEV mileage for the first service?

For most DM-i models, HEV mileage is one of the primary factors used to determine first-service timing. Always verify your specific model's requirements in the owner's manual.

2.Can I perform the first service in another city?

Yes. Authorized BYD service centers throughout the country can typically perform first-service maintenance.

3.Is the first service completely free?

Manufacturer-specified first-service items are usually included at no cost, although optional services may carry additional charges.

4.What happens if I miss the first service deadline?

Contact an authorized BYD service center as soon as possible to discuss your options and determine the appropriate next steps.

5.Is EV-only driving harmful to a DM-i vehicle?

Occasional EV-only operation is perfectly normal, but the engine should also run periodically to maintain optimal mechanical condition.

6.Can I use an independent repair shop for my first service?

Owners concerned about maintaining warranty coverage should generally use authorized BYD service centers.

7.How can I check my HEV mileage?

HEV mileage can typically be viewed through the vehicle's instrument cluster, infotainment system, or dealership service records.

8.When is the second service due?

Service intervals vary by model and market. Refer to your maintenance schedule and owner's manual for exact requirements.

Final Thoughts

The first service for a BYD DM-i vehicle is more than a routine maintenance appointment—it establishes the foundation for your vehicle's long-term service history and warranty record.

To stay on track:

• Complete your first service on time
• Monitor HEV mileage carefully
• Use authorized BYD service centers
• Operate both EV and HEV modes regularly
• Avoid major modifications before servicing
• Retain all maintenance documentation

By following these simple guidelines, you can help ensure your vehicle remains in excellent condition while preserving valuable warranty coverage for years to come.