Shell ROTELLA 550019893 T1 50 Heavy Duty Engine Diesel Oil - 5 Gallon Pail Conventional monograde motor oil for specialty vehicles such as tractors and buses Low ash content, minimizing formation of deposits and helping to keep intake ports clean Outstanding oxidation resistance to help maximize service life Excellent rust and corrosion protection for critical engine parts Optimized dispersant content to help prevent engine sludge and varnish deposits Conventional monograde motor oil for specialty vehicles such as tractors and buses Low ash content, minimizing formation of deposits and helping to keep intake ports clean Outstanding oxidation resistance to help maximize service life Excellent rust and corrosion protection for critical engine parts Optimized dispersant content to help prevent engine sludge and varnish deposits Rotella Heavy Duty, engine oil features multi-functional, low ash additive technology in a synthetic base oil designed to provide highly responsive protection that continuously adapts to your driving conditions.