Servo Synchro 80W-90 is a specially developed gear oil for synchromesh manual gear boxes and transaxle with good low temperature fluidity properties suitable for even sub-zero temperature operation. It offers smooth gear shiftability characteristics. It provides extended oil life compared to conventional API GL-4 oils. Servo Syncro TM 80W90 Is approved by Tata Motors. Servo Synchro TM75W-85 which is a part synthetic oil is also approved by Tata Motors for their HCVs in the 9 speed gear box. Servo Synchro SS 75W-80 meets API GL4, MAN 341 Type E-3,MAN 341 Type Z- 4Volvo 97305 and ZF TE ML 02L credentials and recommended for synchronised Commercial vehicles manual transmissions with potential long drain period of 300000 Kms. Product approved by Tata Motors for use in synchromesh Transmission fitted on. commercial vehicles for long drain applications Tata Motors commercial vehicles for long drain applications. Product approved by Tata Motors for use in Rear axles and live front axels fitted Tata Motors commercial vehicles for long drain applications. Product approved by Tata Motors for extended drain application i.e. 40,000 Kms In synchromesh gear boxes/Transaxels of passenger cars.