Mineral. Its high viscosity is perfectly matched to the high clearances of old machines..
This modern technology motor oil was developed to preserve the seals, gaskets and other sensitive materials of vintage machines with engines that have not been reconditioned. It reduces internal friction and wear and its very low detergency preserves older technology seals and avoids oil duct clogging (unavoidable with deterging formulae). Its high viscosity (grade 50) is perfectly matched to the high clearances of old machines. 300 V Racing 4T is recommended for vintage racing.