GReddy F4 PRO 10W40 Engine Oil for high performance Turbo and NA cars.This oil has the powerful oil films and high oil-pressure stability at high temperatures. It provides efficient protection and lubrication to bring out the Maximum Horsepower of your highly-tuned engine. GReddy F4 PRO is high performance lightweight oil, which protects while reducing friction whatever the RPM. Engines with advanced cylinder heads, including oil actuated camshafts and camshaft-timing designs, benefit highly from the consistent oil pressure of F4 PRO, even under high temperatures.