Mineral engine oil. ideally suited for original engines and gearboxes from 1900-1950. This product contains very few detergents. to ensure full compatibility with paper. felt and fabric seals. The low level of detergents prevents excessive removal of soot and deposits in the lubrication system. It can be used as a running-in oil for shorter drain intervals. The product is fully compatible with non-ferrous metals. such as brass. bronze. copper. Enhanced adhesion for easier starting even after long periods of standstill.