An excellent explanation
20W-50 Engine Oil Comparison – Murphy, my 1972 MGB GT Blog
So for a selection of recommended classic car engine oils click …… classic car oil
a collection of classic car tech tips, tricks, ideas and information all about performance, modifications, maintaining the MG MGB and GT from across the Internet. Also tuning, servicing, repairs and mods on my own classic car a 1975 MGB Roadster
