Castrol Optitemp™ HT 1 LF is a grease which has been designed for the most extreme loads in constant velocity ball joints. It features excellent high and low temperature behavior and due to its special additives guarantees a reduction of the coefficient of friction resulting in reduced fuel consumption and lowered temperatures in the joints. It is also recommended for the application with ventilated boots due to extremely low evaporation losses. The compatibility with boots made of commonly used materials is very good.