DURA LUBE Catalytic & Exhaust Treatment Fuel Additive — 16 fl. oz., protects converters & reduces deposits

Dura Lube Severe Catalytic and Exhaust Treatment is a 16 fl. oz. fuel additive designed to protect catalytic converters and exhaust systems from oil-based contaminants while helping maintain fuel economy.

This concentrated formula is made to be added to gasoline to help reduce deposits and harmful oil poisons that can coat catalytic converters and impair exhaust performance. It’s intended as a preventative and corrective maintenance step to protect the catalyst, lower contaminant retention at the converter inlet, and support smoother engine operation between service intervals.

How do I use Dura Lube Severe Catalytic and Exhaust Treatment?

Add the entire 16 fl. oz. bottle into a full tank of gasoline or follow the dosage guidelines for partial fills. The manufacturer recommends one bottle per 60 liters (16 gallons) of fuel or 30 mL per 3.8 L (1 ounce per gallon). Results can last up to three months or about 5,000 miles, whichever comes first.

• Use one bottle per 60 L (16 gal) of fuel or 30 mL per 3.8 L (1 oz/gal).
• Pour into fuel tank before refueling for easier mixing.
• Repeat every 3 months or 5,000 miles as preventive maintenance.

What benefits does it provide for the catalytic converter and exhaust?

The additive targets oil-derived contaminants and deposit build-up that can reduce catalyst efficiency. By lowering phosphorus and zinc retention at the catalyst inlet, it helps preserve the catalyst’s ability to convert exhaust gases effectively while also supporting overall exhaust system health.

• Helps protect the catalytic converter from oil poisoning and fouling.
• Reduces phosphorus and zinc buildup that can impede catalyst function.
• Aids in maintaining exhaust flow and emission component longevity.

Will this change my engine diagnostics or tune settings?

Dura Lube’s formula is not intended to alter engine control settings or bypass emission devices. The manufacturer explicitly states it will not disable or defeat emission control systems and will not override On-Board Diagnostics (OBD) or illuminate malfunction indicator controls as a tuning or delete product would.

• Not a tuner, delete kit, or emission controller override.
• Does not disable oxygen sensors or emission monitoring equipment.
• Designed for compatibility with standard vehicle emission systems.

How might this affect fuel economy and drivability?

Used as directed, the treatment can help sustain smoother combustion and potentially modestly improve fuel efficiency by keeping the catalytic and exhaust pathways cleaner. Individual results vary with vehicle age, driving style, and existing deposit levels, so improvements may be incremental rather than dramatic.

• May help maintain or slightly improve miles per gallon.
• Supports consistent exhaust performance between service intervals.
• Best results when used as part of regular maintenance before converter replacement.

Who is this for: This 16 fl. oz. Dura Lube Severe Catalytic and Exhaust Treatment is aimed at vehicle owners and technicians who want a preventative additive to protect catalytic converters and exhaust components from oil-related contamination. It’s suitable for gasoline engines across a wide range of passenger cars, light trucks, and fleet vehicles; use it when you suspect converter contamination, during routine fuel system maintenance, or before deciding on an expensive catalyst replacement. Always follow the dosage instructions and manufacturer guidance for safe, compliant use.

Manufacturer note: This product is not designed to bypass, defeat, or shut down emissions control devices and will not override engine OBD systems or malfunction indicator lights.