20-09-2021, 06:14 AM
Assuming you do not have some wild racer.
All lubricants, except possibly some "classic" products, are vastly superior to anything used originally. Viscosity was largely determined by consideration of noise, consumprion and leakage. Hubs now require little more than the races to be packed on assembly. Moly greases help the delicate kingpins and spring shackles. No filter and all cars burn oil, so the cheapest oil fine. Even in the 1960s API SD was about the best available, and all now far beyond that. Note thet the cross over temp of multigardes is low so can be excessively thick and dragging for most running. Diffs and geabox do not need to be full to reduce leakage. Many go to lengths to avoid a full modern readily available EP oil in the back axle but most cars were run with this through the 50s to 70s with no positively identified problem as far as I can ascertain. A modern gear oil adequate and many claim better but not easy to acquire beyond SAE 90 (gear scale). With all modern seals, 90 OK.
All lubricants, except possibly some "classic" products, are vastly superior to anything used originally. Viscosity was largely determined by consideration of noise, consumprion and leakage. Hubs now require little more than the races to be packed on assembly. Moly greases help the delicate kingpins and spring shackles. No filter and all cars burn oil, so the cheapest oil fine. Even in the 1960s API SD was about the best available, and all now far beyond that. Note thet the cross over temp of multigardes is low so can be excessively thick and dragging for most running. Diffs and geabox do not need to be full to reduce leakage. Many go to lengths to avoid a full modern readily available EP oil in the back axle but most cars were run with this through the 50s to 70s with no positively identified problem as far as I can ascertain. A modern gear oil adequate and many claim better but not easy to acquire beyond SAE 90 (gear scale). With all modern seals, 90 OK.