ROTELLA 550045381 T1 Motor Diesel Oil (40 CF/CF-2), 1 Gallon Heavy Duty Oil which provide reliable all-year-round performance in the applications for which they are intended Low ash content minimizes formation of deposits and keeps intake ports clean Outstanding oxidation resistance that maximizes service life Excellent rust and corrosion protection of critical engine parts High dispersancy-detergency protects against sludge and varnish deposits