Industrial Oils

Heavy Duty Diesel Engine OIl

Syncon® Premium EP Gear Oil

Phillips 66® Heavy Duty Diesel Engine Oil is a high-quality universal fleet engine oil designed for use in on-highway diesel trucks and off-highway diesel equipment operating in moderate to hot climates. It also is recommended for passenger cars and light trucks with either diesel or gasoline engines where the OEM recommends SAE 20W-50 or 25W-50 engine oil.

Heavy Duty Diesel Engine OIl


• Excellent soot control for protection against abrasive wear and soot-induced oil thickening

• Excellent resistance to viscosity and thermal breakdown at high temperatures

• Protects against sludge and varnish formation

• Excellent wear protection

• High shear stability

• Excellent rust and bearing corrosion protection

• Good resistance to foaming and aeration


• Older diesel equipment with conventional, non-EGR engines

• Mixed fleets with both diesel and gasoline-fueled vehicles

• Off-highway construction, earth moving and mining equipment

• Farm equipment with diesel or gasoline engines