Fuel additives leaded engines - Castle Products
What is Leaded Gasoline?

Fuel additives leaded engines

There are several proprietary lead-replacement additives available for 'DIY' dosing of unleaded petrol – these will increasingly be found in accessory shops and filling stations.

Additives have been in use in Germany, Austria, Switzerland and New Zealand for some years with no reports of problems, though there are reservations about the effect of a sodium based product on turbo-charger blades.

Additives may be phosphorus, sodium, potassium or manganese based – and are quite satisfactory used at the correct dosing rates in appropriate vehicles.

The following fuel additives were found satisfactory in engine durability tests set up by the British Historic Vehicle Clubs:

* Millers VSP Plus, (manganese) Millers Oils Ltd. Freephone 0800 281 053 * Red Line Lead Substitute, (sodium) Delta Oil Ltd. 01476 861 195 * Superblend Zero Lead, (potassium) Superblend Lubricants Ltd. 0116 291 1700 * Castrol Valvemaster & Valvemaster Plus (phosphorus) Castrol Ltd. 01793 452 222 * Carplan Nitrox 4-Star (potassium) & 4-Lead (manganese) Carplan Ltd. 0161 764 5981

In general, it's best to choose one product and stay with it, though some inter-mixing will be inevitable at times.

Where the vehicle manufacturer originally recommended the use of, for instance, one tank of leaded petrol to four tankfulls of unleaded, if you are using an additised fuel the additive should be used in every fill.

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Popular Q&A

avatar
What will happen if i run leaded gas in an unleaded fuel engine?

The engine will be fine. But the catalytic converter in the exhaust system will get plugged up. Usually the sensors get messed up and the engine doesn't run right. The catalytic converter gets extremely hot and can catch on fire.

avatar
What will happen if i run unleaded gas in a leaded fuel engine?

I don't believe there is a such thing as a leaded fuel engine. All gasoline is unleaded, some just a higher grade.

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