Hi guys, I've just got an old, faulty Sellarc (W Bateman Ltd) belt driven compressor. I've fixed the start capacitor centrifugal switch (corroded spring) and replaced the start capacitor (dead) and it now works! However, the twin piston cast iron compressor unit has a label on which says to use "Shell Corena Oil D37. I can't find any reference on the Shell site to that spec, and Google is coming up blank for modern equivalents. I suspect I can use a modern SAE30 compressor oil, but if I'm buying it specifically for the compressor, I might as well get what was specified. Anyone know what the modern equivalent is?