1993 Buick Roadmaster Owner's Manual - Page 256

Automatic Transmission Fluid When to Check and Change: A good timeto check your auiomatic transmission fluid level is when the engineoil is changed. Refer to the Maintenance Schedule to determine when to change your fluid. See "Scheduled Maintenance Services" in the Index. Wait at least 30 minutes before checking the transmission fluid levelif you have been driving: 0 0 When outside temperatures are above.90 F '(32 C); high for At speed quite a while. I How to Check: Because this operation can a little difficult, you be may choose to have this done at a Buick,dealershipService Department. If you do it yourself, be sureto follow allthe instructions here, or you could get a false reading on the dipstick. . In heavy traffic -&speciallyinhotweathEr.: ...While pulling a trailer. To get the right reading, the fluid should be at normal operating temperature, which is 180 F to 200 *F (82 C to 93 C). To check transmission fluid hot: the vehicle 'warmed Get up by driving about15 miles (24 krn) when outside temperatures are above 50 F (10 C). If it's colder than 50 F (10 C), drive the vehicle in "D" (3rd Gear) until the engine temperature gage moves and then remains steady for ten minutes. Then follow the hot check procedures. To check transmission fluid cold: cold check is made A after the vehicle has been sitting 8 hours or more for as with the engineoff and is used only a reference. Let 5 the engine run at idle forminutes if outside temperatures are 50 F (10 C) or more. If 'it's colder F than 50 O (10 * C), you may haveto idle the engine when fluid is added longer. A hot check must€0110~ during a cold check. . 254