single weight only if you pre heat your oil for a race Grafico de viscosidades: Motores
I use Eurospec 0W-40 Mobil-1, Penzoil Platium, Castrol made in Europe, etc if it meets the Mercedes .29 spec the natural gas base oil has tremendous film strength
read his corvair oil paper if you have not- hyd flat tappett Oil selection | Widman International SRL Widman International SRL
straight 30 even in san antonio is going to have more wear