We have made very good experiences with Penrite Oils. For the MGB we recommend either the
CLASSIC 20W/50 or Penrite's top product
HPR 20W/60, high performance multigrade oils with the correct viscosity for the MGB. The results are less oil consumption and better oil pressure: now your engine shows the oil pressure again as mentioned in the original works data. More information on our Penrite-Pages.
Here are the most important items for the oil change: