Reawaken your engine's
hidden power.

1 The Royal No-Cure-No-Pay Guarantee

If your engine does not show measurable improvement under our published thresholds, the labour portion of the Tuneup is waived.

How "measurable improvement" is defined

Pre-service and post-service measurements are taken at the same LTO-accredited emissions testing centre and the same accredited dynamometer testing centre, within seven (7) days of one another. Improvement qualifies if either of the following is satisfied:

• Emissions improvement: a measurable reduction of at least 10% in Hydrocarbons (HC), Carbon Monoxide (CO), or Nitrogen Oxides (NOx) from baseline — or a re-classification into a cleaner emissions band.
• Power improvement: a measurable increase of at least 3% in peak wheel horsepower or peak torque from baseline — or a documented flatter, smoother power curve from the dynamometer operator.

Most engines improve on both metrics; older diesels often improve more on emissions, lightly-tuned petrol engines often improve more on power. Either alone is sufficient to qualify.

If your engine is already optimal

Some engines — particularly low-mileage, well-maintained vehicles — show no meaningful baseline opportunity. After Phase A diagnostics, if our tests indicate your engine is already operating at or near peak condition, we will inform you in writing, refund 100% of your Diagnostic Audit fee, and decline the Tuneup. You drive away knowing your engine is healthy — and you owe us nothing further.

Operating conditions for the verification tests

• Same accredited facility for both baseline and post-service tests.
• Same fuel grade and brand for both tests (supplied at our cost).
• Engine oil temperature within the same operating window for both tests.
• No third-party modifications, ECU re-flashing, or chip-tuning between the two tests.
• All five sub-services of Phase C completed — partial-service customers are not eligible.

2 The Royal Assurance Programme — 10,000 km

Approximately 10,000 km after your Tuneup, we invite you back at no charge for two checks: a UK laboratory oil analysis and a dynamometer power verification. If either reveals a covered failure, the remediation is performed at no cost to you.

Eligibility — your vehicle qualifies if

• The verification visit takes place between 8,000 km and 12,000 km after your Tuneup.
• The visit takes place within 12 calendar months of your Tuneup, whichever comes first.
• The vehicle returns to the PurePowerDrive facility for sampling and testing — we control chain of custody.
• The VIN matches the vehicle that received the original Tuneup.
• No other facility has serviced or added oil to the vehicle since the Tuneup (a complete service log will be reviewed at intake).
• The vehicle has not been modified — engine remap, intake or exhaust modifications, chip-tuning, forced-induction changes — since the Tuneup.

Oil-change guarantee — exclusions

Free engine oil and filter replacement is not covered when oil failure is attributable to:

• External contamination — coolant ingress (head-gasket failure), fuel dilution beyond normal range (failed injector), water ingress from flooding or deep wading.
• Use of a fuel grade lower than the manufacturer's specification (verifiable via residual fuel sample).
• Track use, motorsport, or sustained high-RPM operation (verifiable via ECU over-rev logs).
• Extended idle storage causing oil oxidation.

Power-restoration guarantee — exclusions

Free power restoration is not covered when power loss is attributable to:

• Mechanical wear or failure outside the Tuneup scope — turbocharger bearing wear, valve guide wear, ring or cylinder wear, timing chain stretch.
• External damage — accident, water ingress, foreign-object ingestion, contaminated fuel from external sources.
• Aftermarket modifications affecting power — intake, exhaust, ECU remap, transmission tuning, forced-induction changes.
• Sustained operation outside manufacturer parameters — track days, racing, sustained over-rev events.
• Customer-skipped manufacturer-recommended interim maintenance items (e.g., spark plug change at the marque's specified interval).
• Power loss of less than 5% from post-Tuneup baseline (within normal measurement variance).

The diagnostic gate

If the 10,000 km dynamometer test shows a power loss, we run a diagnostic to determine root cause before any work is performed:

• If the root cause is within the Tuneup scope — carbon return, injector re-fouling, oil degradation — the remediation is covered. No charge.
• If the root cause is external — any of the exclusions above — we share the diagnostic findings with you, charge a fair diagnostic fee, and quote the necessary repair separately. You decide whether to proceed.

This procedural gate ensures the Programme remains genuinely free for the failures we are accountable for, and sustainable for both parties over the long term.

Your Royal Dossier

Each oil analysis report from the UK laboratory becomes part of your vehicle's permanent Royal Dossier — yours to keep, and a documented service history that supports resale value when the time comes.