Castrol Trans-C HT is a full synthetic transmission/hydraulic fluid that balances high-temperature wear protection for gears and bearings with low temperature flow properties for positive shifting in transmissions. Its full synthetic formulation allows for extended drain intervals with regular used oil analysis. It meets the requirements of Caterpillar TO-4 and is recommended for use where TO-4, TO-4M, C-4 and Vickers 35VQ25 is specified.
In field tests on various types of earthmoving equipment, Castrol Trans C HT stretched service intervals to more than 5000 hours in hydraulic systems and more than 2500 hours in powershift transmissions without problems.
The excellent gear protection offered by Castrol Trans C HT was further demonstrated during a D 4998 gear wear test. The FZG is a heavily loaded spur gear test commonly used to evaluate gear oil performance. The gear wear directly correlates to weight loss, with less weight loss being equal to less wear. Castrol Trans C HT was tested versus other TO-4 type fluids and showed the least gear weight loss.