20w50 oil from leading brands including Carlube, Miller's and Comma Classic. This is a high viscosity oil specifically produced to protect and preserve old engines. High viscosity helps to reduce oil loss & leakage. It should not be used in modern multi-valve engines, but is ideal for classic cars and engines produced before the 1980's. Older engines were developed to suit multigrade oils. As car production has become more sophisticated and technological so have the oils. Gone are the days when one grade would fit most cars. Today's precision engines demand oils with very precise levels of viscosity which would not be suitable for a classic car. Instead choose from our range of quality 20w50 oil at classic prices!