Shell Spirax S6 ATF A668 Transmission Oil Case Of 3 (1 Gallon) btpcat_other_354300043 Maintaining system efficiency Shell Corena Maintaining system efficiency Shell Corena S2 P helps prevent the formation of carbon deposits and lacquer on valves and piston crowns at high working temperatures and pressures ClarkShell Spirax S4 TXM is also recommended for use in Case equipment where fluids meeting MS 1207 Spirax S6 ATF A668 is approved for extended service intervals and remains stable even under severe operating conditions heavy duty automatic transmission fluid which is specifically designed and approved for use in transmissions requiring Allison TES 295 fluids