Can Using the Wrong Engine Oil o r Fuel Additives Damage the Catalytic Converter?

Home > Gari Forums > Toyota Forums > Toyota Camry Forums > Toyota Camry Catalytic Converter Issues Forums

Can Using the Wrong Engine Oil o r Fuel Additives Damage the Catalytic Converter?

Do engine oils with high zinc o r phosphorus content contribute to catalytic converter failure? Are fuel additives beneficial o r harmful for the Toyota Camry in the long run?

Lubaba asked on 22 Feb 2025 11:31:38 am

1 Answer

29 views |

Car Mechanic Expert - on 22 Feb 2025 11:37:59 am

Yes, the wrong engine oil o r fuel additives can harm the catalytic converter:

High Zinc o r Phosphorus Content in Engine Oil: Oils with high levels of zinc o r phosphorus can damage the catalyst material in the converter, reducing its efficiency.
Harmful Fuel Additives: Some fuel additives, particularly those not designed for modern catalytic converters, can cause deposits that damage the catalyst over time.

Recommendation: Always use engine oil that meets the manufacturer’s specifications and avoid fuel additives unless they’re specifically designed for catalytic converter protection.