Older cars have special characteristics
Oil formulations required for modern vehicles are very different from those needed for older vehicles.
Oils for modern engines comply with the latest API ratings of SN/CF and specific ACEA and OEM specifications dealing with fuel efficiency, extended drain intervals and aftermarket exhaust treatment systems and are specifically designed for the modern engine needs.
A classic car engine, however, can have the opposite characteristics with cork/graphite/rope seals, low-pressure gear driven oil pumps, larger oil galleries with greater dependence on "splash" and "cling" lubrication, lower revving with larger machine clearances.
Such a widely different engine design demands a totally different lubricant and the Castrol Classic Oils range offers formulations for older vehicles that have been specially blended for the work they have to do.
The consequences of using inapropriate oils
Inadequate detergent can result in gums and lacquers clinging to the hotter engine components, and blocking oil galleries - but too much detergent can cause a build-up of metallic ash in the combustion chambers and piston crowns.
In older engines with traditionally high oil consumption, this can cause detonation and pinking.
Avoid corrosion and rust
Engine internals can become pitted with corrosion and rust from acids and water vapour formed during combustion. With the correct corrosion inhibitors, the components are well protected.
Special dispersant additives prevent soot: wear metals and the by-products of combustion settling out in the sump and other areas of the engine, and forming a thick sludge that can block filters and oil ways.
Protect your classic vehicle's engine
If there is inadequate pour point depressant the oil ceases to flow at low temperatures, with excessive strain on the oil pump or in certain cases, oil starvation on start-up causing complete failure of the lubrication system.
Castrol Classic Oils are specially formulated in the style of the oil in using the most appropriate and carefully balanced additive technology to provide the best protection and performance for your classic engine.