When that happens, they sludge-up, form deposits and have to be changed. AMSOIL lubricants resist breakdowns, so they stay intact and run clean. The resistance to heat and oxidation prolongs the service life of AMSOIL synthetic lubricants, significantly extending drain intervals.
Low Temperature Fluidity/High Temperature Stability:
AMSOIL Synthetic Lubricants and Oils resist the effects of heat and cold far better than nonsynthetic lubricants. AMSOIL synthetics will make the difference when starting an engine that's cold, and cooling an engine that's hot!