Penrite Shelsley Medium


Engine oil for vehicles originally specifying a Medium Grade Oil or an SAE 40 (5 litre)


A low detergent multigrade 25W/70 engine oil intended for vehicles manufactured between 1920 and 1950.  Shelsley Medium is designed for vehicles originally specifying a ‘Medium’ Grade Oil or a SAE 40, and will provide better cold circulation and higher hot oil pressure than a ‘straight’ or monograde oil.  

Shelsley Medium is suitable for larger engined vintage and pre-war vehicles which have either troughs or dipper type lubricating systems, or early types of pressure feed systems. It is also suitable for those employing total loss oiling systems and for larger capacity sleeve valve engined cars such as Minerva, Mors, Knight and Daimler.

Shelsley Medium is ideal for use in early vintage (pre 1950) motorcycles, incorporating sight glasses, pilgrim oil pumps and total loss lubrication systems. It is suitable for use in motorcycles fitted with a wet clutch.

The oil contains a “Tacky Additive” so that when vehicles are laid up, the engine oil doesn’t run off the internal surfaces. This combined with an increased level of rust inhibitor, provides protection against corrosion and deterioration when the engine is not used or in storage.

If you are concerned about the sensibility of multigrade oil in vintage engines, please call us to discuss.

Characteristics Penrite
Shelsley Medium
SAE Viscosity 25W-70
Viscosity Index (VI) 140
Performance Level API: SC / CC
Zinc as ZDDP 1400
Base Oil Group Grp II
Detergent-Dispersant Package Low
Other Includes corrosion protection & tackiness
additive for lay-up periods

Penrite Shelsley Medium is available with out Insight Motor Oil Analysis Programme – click here for more details.

Additional information

Weight 5 kg


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