Purpose and Specifications

The STP Diesel Emissions Reducer is a 400ml diesel fuel additive that cleans your fuel system, removes harmful deposits, and reduces exhaust emissions, smoke, and noise for smoother, cleaner engine performance.

Key specs: Treats up to 50-60 liters of diesel fuel. Use every 2,000 km (1,250 miles) or one full tank before your emissions test or MOT. Works in all diesel engines to keep injectors and intake clean, improving cold starts even in temps down to 0°C.

• Cleans fuel injectors and system components that affect emissions
• Helps pass emissions tests easily
• Reduces smoke and noise for quieter runs
• Boosts cetane for better cold weather starts

When to Use / Replace?

Add one bottle every 2,000 km or monthly for regular maintenance to prevent buildup. Use before emissions tests, if smoke increases, or during winter for reliable starts. Shelf life is 3 years unopened; replace if fuel system feels sluggish after 10,000 km without treatment.

FAQ

Q: How do I use STP Diesel Emissions Reducer?
A: Pour the entire 400ml bottle into a full tank of diesel (50-60L). Safe for all diesel engines.

Q: Will it help me pass my MOT emissions test?
A: Yes, add one tank before your test to clean emissions-related parts and lower smoke levels.

Q: Can I use it every fill-up?
A: Best every 2,000 km for ongoing cleaning; daily use isn't needed but won't harm your engine.