Castrol Classic GP50


🇦🇺 We ship the Castrol Classic GP50 anywhere in Australia!

Australian Authorised Supplier – Lawless Classic Oils

Never compromise quality. Our products are 100% Castrol Classic Authentic.

SKU: N/A Category: Tags: , , ,



High performance SAE50 engine oil. Castrol Classic GP50 is an advanced high performance, high viscosity petrol engine oil. It is formulated with high quality mineral oils, plus carefully selected additives to satisfy the lubrication requirements of large capacity engines in arduous conditions, certain motorcycles ‘street machines” and those involved in motor sport with such engines.

Castrol Classic GP50 is a fully formulated API SG/CD premium engine oil and may be used for normal oil change periods in high performance road cars. Castrol Classic GP50 has better start-up characteristics than normal straight SAE 50 oils, and as good as or better than straight SAE 40 oils.

Castrol Classic GP50 has been very successfully used in Group A, Formula Holden, Drag Racing, Nascar and inboard boat engines.

Note: Castrol Classic GP50 is a “Heavy” viscosity SAE25W/50 oil and care should be taken during initial warm up before maximum performance/revs are utilised. When used with alcohol fuel, for speedway or drag racing GP50 should be used as a “one meeting” oil.

Castrol Classic GP50 Sizes

  • 1 Litre
  • 1 Gallon
  • 5 Litre
  • 20 Litre

Castrol Classic GP50 was developed for racing, making it particularly suitable for high performance classic cars and motorcycles. This oil was widely used in vehicles pre-war and during the 1940s was also used in aero engines. Its excellent high temperature performance and film strength makes it a popular oil for larger engines that are hard on their lubricants, and it remains popular in the classic racing world today.

  • High performance engine oil

  • For pre-1950 cars and pre-1970 motorcycles
  • Traditional low detergent SAE 50 monograde engine oil

  • Offers excellent high temperature performance

  • Excellent noise suppression

  • Very high level of engine wear protection



Castrol Classic GP50 Product Identifier

Product Name

Product Code

SDS no.

Product Type

Castrol Classic GP 50 469207-GB05 469207 Liquid

Castrol Classic GP50 Typical Characteristics




Castrol Classic GP50

Density @ 15C, Relative ASTM D4052 g/ml 0.895
Viscosity, Kinematic 100C ASTM D445 mm²/s 19.1
Viscosity, Kinematic 40C ASTM D445 mm²/s 224
Viscosity Index ASTM D2270 None 96
Pour Point ASTM D97 °C -18
Flash Point, PMCC PMCC ASTM D93 °C 230
SAE Viscosity Rating J300 50


Additional information

Weight N/A
Dimensions N/A

1 Litre, 1 Gallon, 5 Litre, 20 Litre


There are no reviews yet.

Be the first to review “Castrol Classic GP50”

Your email address will not be published. Required fields are marked *

Orders over 15kg

Get in touch with us

Don’t hesitate to get in touch with us today; we’ll be happy to organize the most competitive shipping rates on your behalf.

Lawless Classic Oils

ABN 40 667 871 730

Information and enquiries: call Michael 0417 929 966

Authentic Castrol Classic Products

Castrol Classic ranges have a partnership with Castrol that goes back over 30 years and we are proud to have been appointed Authorised Australian supplier for Castrol Classic lubricants

Castrol Classic Oils. ‘CASTROL and the Castrol logo are trade-marks of CASTROL Limited, used with permission’.