1999 GMC Trucks C-Series

Fluids Capacities and Specifications

Engine Oil Capacities
7.2 L21 quarts(19.8 L)

Additional oil is required with auxiliary oil filter systems. Make sure to add enough extra oil to fill the auxiliary oil filter system. For LUBERFINER 750-C systems, add 14 qts. (13.25 L). Extending the recommended oil change interval requires the use of an infrared oil analysis program which shows the condition of the oil and its additives. For more information, consult your GM Truck dealer, who is an authorized Caterpillar engine dealer.
7.4 L8.0 quarts(7.8 L)
Automatic Transmission Fluid Capacities
Automatic Transmission
AT542 (For Oil Pan Filter Change)30 pints(14 L)

Add two pints (one liter) when changing spin-on Filter.
AT545 (For Oil Pan Filter Change)40 pints(19 L)

Add two pints (one liter) when changing spin-on Filter.
MT643 (For Oil Pan Filter Change)36.0 pints(17.0 L)

Add two pints (one liter) when changing spin-on Filter.
MT653 (For Oil Pan Filter Change)36.0 pints(17.0 L)

Add two pints (one liter) when changing spin-on Filter.
Manual Transmission Fluid Capacities
Manual Transmission
RT660912.0 pints(5.8 L)
RT661012.0 pints(5.8 L)
RTO661012.0 pints(5.8 L)
RT661316.0 pints(7.5 L)
RT7608LL19.5 pints(9.3 L)
RT860915.0 pints(7.0 L)
FS4205A, FS4205B, FS4205C12.5 pints(5.9 L)
5205A, FS5205C12.5 pints(5.9 L)
FS530619.5 pints(9.2 L)
FS6305A, FS6305B19.5 pints(9.2 L)
FS630619.5 pints(9.2 L)
FS720620.0 pints(9.5 L)
T8607B36.0 pints(17.0 L)
Cooling System Capacity
Cooling System
7.2 L
With Manual Transmission32.0 quarts(28.9 L)
With Automatic Transmission30.0 quarts(28.4 L)
7.4 L
With Manual Transmission25.0 quarts(23.7 L)
With Automatic Transmission23.0 quarts(22.7 L)
Fuel Tank Capacities
Fuel Tank
Standard50 gallons(189.0 L)
Optional35 gallons(132.5 L)
Optional60 gallons(227.1 L)
Optional70 gallons(265.0 L)

Two 35-gallon (132 L) tanks
Optional100 gallons(378.5 L)

Two 50-gallon (189 L) tanks
Air-conditioning Capacities
Air Conditioning Refrigerants Capacity2.5 pounds(1.134 kg)

Rear Axle Oil Capacities
Rear Axle
Single Speed
15040S21.0 pints(10.0 L)
19060S28.0 pints(13.2 L)
21060D28.0 pints(13.2 L)
21060S28.0 pints(13.2 L)
22060S28.0 pints(13.2 L)
22080S40.0 pints(19.0 L)
23080S40.0 pints(19.0 L)
2343140.0 pints(19.0 L)
23105S48.0 pints(22.7 L)
26085P41.0 pints(19.5 L)
26105S48.0 pints(22.7 L)
30105S46.0 pints(21.8 L)
19060T35.0 pints(16.7 L)
21060T33.0 pints(16.6 L)
22060T35.0 pints(16.6 L)
23080T39.0 pints(18.4 L)
26080T41.0 pints(19.5 L)
Tandem Axles
DS404, DS404P (front)29.0 pints(13.7 L)
RS404 (rear)34.0 pints(16.1 L)
DT402P (front)34.0 pints(16.1 L)
RT402 (rear)34.0 pints(16.1 L)
front29.0 pints(13.7 L)
rear28.0 pints(13.2 L)
front29.0 pints(13.7 L)
rear28.0 pints(13.2 L)

Many people saved thousands of dollars by doing some technical service procedures for their 1999 GMC Trucks C-Series by themselves. The easiest type of technical maintenance is changing engine oil, axles oil, manual and automatic transmission oil. Changing break fluid in 1999 GMC Trucks C-Series is also is a simple task. If you want to change engine oil, for instance, by yourself and save a couple of bucks you need to know how much this fluid engine oil is needed for 1999 GMC Trucks C-Series. If you fill engine or axles of your car with oil to the brim it may damage your vehicle engine or axles and void manufacturer warranty. Good news! We have this information and we give it to you for free.

Note: all capacities are approximate. When adding, be sure to fill to the appropriate level, as recommended in user manual for your 1999 GMC Trucks C-Series. Keep in mind that all information here is provided “as is” without any warranty of any kind.

Note: not all air conditioning refrigerants are the same. If the air conditioning system in your vehicle needs refrigerant, be sure the proper refrigerant is used. If you're not sure, ask your dealer.

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