safely operated without preheating the fluid. Preheat with auxiliary heating equipment or by running the equipment or vehicle with the transmission in P (Park) or PB (Auto-Apply Parking Brake), if available, or N (Neutral) for a minimum of 20 minutes before attempting range operation. Table 1–1. Transmission Fluid Operating Temperature Requirements
Ambient Temperature Below Which Preheat is Required Viscosity Grade
Celsius
DEXRON®-III
–27
Fahrenheit
–17 (Ref. SIL 13-TR-90)
1–6. TRANSMISSION FLUID AND FILTER CHANGE INTERVALS CAUTION: Transmission fluid and filter change frequency is determined by the severity of transmission service. More frequent changes may be necessary than recommended in the general guidelines when operating conditions create high levels of contamination or overheating. a. Frequency. Table 1–2 is given only as a general guide for fluid and filter change interval.
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