About Castrol Classic Oils
Castrol's Classic Oils are produced to original viscosities, using low detergent
formulations and contain optimum levels of anti-wear additive for maximum engine
wear protection. The range covers Veteran, Vintage and Classic motor vehicles
from the turn of the century to the mid 1980's.
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.