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Cat Transmission/Drive Train Oils
Cat TDTO (Transmission/Drive Train Oil) is balanced in order to give maximum frictional material service life and performance in Cat transmissions. Cat TDTO exceeds the requirements for the Cat TO-4 oil specification which includes the frictional requirements and gear wear requirements. Cat TDTO is offered in different lubricant viscosity grades for maximum service life of components at high ambient temperatures and heavy-duty cycles.For optimum transmission service life and performance, Cat TDTO is recommended. Refer to Table 1 for Cat Marine Transmissions recommendations.
Table 1
Lubricant Viscosities for Ambient Temperatures for Cat Marine Transmissions
Oil Type and Performance Requirements Cooling of transmission Viscosity Grade °C °F
Min Max Min Max
Cat TDTO
Cat TO-4 Raw/Sea Water SAE 30 −15 80 5 176
SAE 50 −5 95 23 203
Jacket Water SAE 50 −5 95 23 203 Consult your Cat dealer for part numbers and for sizes of available containers.Cat TDTO oil is formulated for transmissions and drive trains only, and should not be used in engines. Shortened engine life will result.
Cat GO is not the same as Cat TDTO, and does not meet Cat TO-4 or TO-4M oil Performance Requirements. Cat GO or commercial gear oils should not be used in compartments that specify Cat TO-4 or TO-4M oil.
Commercial Transmission Oils
If Cat TDTO (Transmission/Drive Train Oil) is not used, commercial oils (second choice oils) must meet Cat TO-4 specifications in order to be allowed for use in Cat marine transmissions. Use TO-4 specification oils that are single grade only. Refer to Table 1 for recommendations.Commercial Marine Transmissions
For marine transmissions which are not manufactured by Cat, refer to the lubrication recommendation of the Original Equipment Manufacturer (OEM).