Classic mineral engine oil no modern low-SAPS requirement, moderate zinc (ZDDP) level beneficial for flat-tappet cam/rocker wear protection
Penrite Classic Series HPR30 / Castrol Classic XL30
138 ci (2.26L) enlarged Grey motor, first used in FE. Capacity is a typical estimate for the larger-capacity Grey block not confirmed against a factory manual.
GL-5 additive packages are generally avoided in older brass-synchro gearboxes GL-4 is the safer choice. Capacity is a typical estimate, not confirmed against a factory manual.