Mineral engine oil. ideal for 1900-1950s original engines and transmissions. This product contains very few detergents. to ensure full compatibility with the paper. with 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 break-in oil with a shorter change interval. The product is fully compatible with such non-ferrous metals. like brass. bronze. copper. Reinforced adhesion for easier starting even after a long period of standing.