Castrol Classic Monograde Mineral Oil XXL 40 4.54L / 1 Gallon Classic Cars SAE40

Castrol Classic Monograde Mineral Oil XXL 40 SAE40 – 4.54L / 1 Gallon – Premium Engine Oil for Classic Cars & Motorcycles 

*Made in the UK*

Premium Quality Monograde Engine Oil for Vintage & Veteran Vehicles – For Pre-1950 Cars & Pre-1970 Motorcycles

Castrol Classic XXL40 is a high-quality SAE 40 monograde engine oil specifically formulated for older technology classic cars, and vintage motorcycles. Made with premium mineral oils and carefully selected additives, XXL40 delivers robust lubrication, dependable wear protection, and stable performance for engines built before modern multigrade oils became standard.

Perfect for pre-1950 road cars and pre-1970 single or multi-cylinder motorcycles, this oil is trusted by enthusiasts who demand authentic performance for engines built before modern multigrade oils became standard.

Whether you own a classic Fiat, Alfa Romeo, Lancia, MG, Bentley, Rolls-Royce, Triumph, Jaguar, or any pre-1950 vintage make, Castrol Classic XXL40 delivers the authentic performance and protection your engine was designed for.

Key Features:

• Ideal for Pre-1950 Classic Cars & Pre-1970 Motorcycles - Suited to older engine designs with wide tolerances and traditional gauze-type oil filters.

• Premium SAE 40 Monograde Oil – Ensures consistent oil pressure and stable lubrication under both road and competition conditions

• Recommended for Classic Motorcycles – Suitable for many single and multi-cylinder motorcycles up to the 1970s for both engine and gearbox lubrication. Matches the original handbook recommendation for bikes using roller main bearings.

• Excellent Summer Oil (Also useful for high oil consumption engines in winter) – Commonly used as summer-grade oil for vintage engines. Also ideal in winter for engines that exhibit higher oil consumption.

• Low Detergent Formula (API:SB) - Balanced detergent level prevents the build-up of metallic ash, reducing the risk of detonation or pinking in high-consumption engines.

• Balanced Low-Detergent Formula - Protects against gum and lacquer formation, will not dislodge carbon deposits in ageing engines, compatible with traditional seals (cork, rope, graphite)

• Designed for Traditional Filters & Oil Systems - Perfect for early lubrication systems using splash-feed or low-pressure pumps.

• Classic Tin Can Design (4.54L / 1 Gallon) – Vintage packaging, perfect for display and storage

• Made in the UK – Trust in the premium quality of Castrol, a leading brand for classic vehicle maintenance

Why Choose Castrol Classic XL30?

Castrol Classic XXL40 is specifically engineered to replicate the performance characteristics required by mid-century engines:

• Provides thick, stable oil film strength for older engines with larger clearances

• Helps maintain oil pressure at higher operating temperatures

• Reduces wear in classic engines used for touring, regular driving, or competition

• Compatible with early gasket and seal materials

• Trusted by owners of vintage Fiats, Alfa Romeos, Lancias, MGs, Austins, Nortons, BSAs, Triumphs, Jaguars, and many more

Purchase with confidence knowing you’re using a trusted brand that’s been a staple in vehicle maintenance for decades.