Does anyone have any experience with Penrite Shelsley Medium 25W70 Oil?
Here is the write up about it:
Penrite Shelsley Medium SHELM005 Engine oil for vehicles originally specifying a Medium Grade Oil or an SAE 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.
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
I would not use anything heavier than #30 and prefer 10W-30 for dipper type Chevrolet egines. #70 will not break-up into a mist as required for your 1933 engine.
Wow that is crazy thick! Even the 25W spec is thick at cold startup but the 70 base is really thick. Might slow some leaks but I wouldn't want to use anything that thick in any of these old cars except maybe oil some door hinges. Obviously been well thought out and specifically designed and spec'd for some unique engine somewhere but not these.
You want an oil with the 2nd number no greater than a 30 and there are many inexpensive and great quality oils in 5w30 and 10w30 ranges readily available that have great specifications. If you want fancy, buy a Full Synthetic 5w30 or 10w30.
1938 Canadian Pontiac Business Coupe (aka a 1938 Chevy Coupe with Pontiac shaped front sheet metal - almost all Chevy!) 1975 4-speed L82 Vette
