The 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 can demand 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.
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.
In older engines where the carbon has built up over a number of years detergents can have a scouring effect, causing the carbon to flake off, blocking up oil galleries and spray jets. High levels of detergent can also "wash" traces of carbon from seals and gaskets, revealing oil leaks where the carbon itself is creating a seal.
Insufficient anti-oxidant and the oil can quickly thicken during high temperature motoring, with large amounts of carbon, gum and varnish clogging oil galleries, filters and piston rings.
Anti-wear additives are added to ensure that if the oil film between moving parts breaks down prematurely, metal to metal contact and irreparable engine damage is prevented.
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.
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 original products, but using the most appropriate and carefully balanced additive technology to provide the best protection and performance for your classic engine.
The Castrol Classic Range is available nationally from over 600 of the country's leading marque specialists.
For the Castrol Recommended Oil for early vehicles including Where to Buy Contact Us
For Castrol Classic accessories Click Here
Classic Engine Oil sizes: 500 ml, 1 litre, 4.54 litres (1 gallon), 5 litres, 20 litres, 208 litres
CASTROL CLASSIC XL 20W-50
For pre-1980 classic cars and motorcycles
A conventional 20W-50 multigrade engine oil of good all round performance, formulated with high quality mineral oils plus selected additives, ideally suited to older technology and classic car engines.
Offers excellent oil consumption, and a very high level of engine wear protection.
For pre-1950 veteran, vintage and classic cars
A high quality SAE 30 Monograde engine oil which is also used in most types of manually operated gearboxes fitted to vintage and classic cars. Also specified for pre-selector type gearboxes.
Offers excellent cold temperature starting, and improved oil pressure at high operating temperatures.
For pre-1950 cars and pre-1970 motorcycles
High quality SAE 40 Monograde engine oil, recommended for single and multi-cylinder engines under road and competition conditions.
Castrol XXL 40 is also recommended for many single and multi-cylinder pre 1970 classic motorcycles for engine and gearbox lubrication.
For pre-1950 performance cars and pre-1970 motorcycles
Traditional, low detergent, SAE 50 Monograde engine oil, which offers excellent high temperature performance, excellent noise suppression and a very high level of engine wear protection.