The Elba Aircomp-D Series is formulated from highly refined hydrocracked base stocks and the unique additive SYNTHOLATE. The addition of SYNTHOLATE inhibits the formation of varnish and carbon and provides superior thermal and oxidative stability. Utilizing the superior petroleum base stocks fortified with SYNTHOLATE extends the life of the Elba Aircomp-D Series compared to that of conventional mineral oils and provides the following money saving benefits.