Shell Rotella diesel exhaust fluid (DEF) is for the selective catalytic reduction systems used in most 2010 and later on-road diesel-powered trucks and Tier 4-F construction equipment.

Meeting the chemical requirements of ISO 22241 (AUS 32), Shell Rotella DEF conforms to manufacturing standards and certification requirements for API Certified Diesel Exhaust Fluid, and is available in 2.5-gallon containers. This size provides the optimal level for top-up of many smaller DEF tanks and “emergency” filling of larger DEF tanks, the company says. The product is suitable for heavy-duty trucks, diesel pickup trucks, diesel cars, off-road equipment, and stationary engines.