Fluids Capacities and Specifications

Engine Oil Capacities
Crankcase
366 (6.0 L)	8 quarts	(7.5 L)
403 (6.6 L)
Less Filter	19 quarts	(18.0 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 vehicles equipped with the LUBERFINER 750-C, add 14 quarts (13.25 L).
Oil Change With Filter	21 quarts	(20.0 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 vehicles equipped with the LUBERFINER 750-C, add 14 quarts (13.25 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.
Manual Transmission Fluid Capacities
Manual Transmission
RT6609	12.0 pints	(5.8 L)
RT8608LL	19.5 pints	(9.3 L)
RT8609	15.0 pints	(7.0 L)
FS4205A, FS4205B	12.5 pints	(5.9 L)
FS5205A, FS5205B	12.5 pints	(5.9 L)
FS5306	19.5 pints	(9.2 L)
FS6305A, FS6305B	19 pints	(9 L)
FS6306	18 pints	(8.5 L)
FS8206	20.0 pints	(9.5 L)
Fuel Tank Capacities
Fuel Tank
Standard	50 gallons	(189.3 L)
Optional	100 gallons	(378.5 L)
Two 50-gallon (189 L) tanks
Rear Axle Oil Capacities
Rear Axle
Single Speed
15040S	10.7 quarts	(10.1 L)
19060S	13.5 quarts	(12.8 L)
21060S	15.5 quarts	(14.7 L)
23080S	21.5 quarts	(20.3 L)
26105S	19.0 quarts	(18.0 L)
Two-Speed
19060T	13.5 quarts	(12.8 L)
21060T	15.5 quarts	(14.7 L)
22060T	17.2 quarts	(16.6 L)
23080T	21.5 quarts	(19.4 L)
Tandem Axles
DS404 (front)	16.0 quarts	(15.1 L)
RS404 (rear)	15.5 quarts	(14.7 L)

Many people saved thousands of dollars by doing some technical service procedures for their 1998 GMC Trucks T-Series by themselves. The easiest type of technical maintenance is changing engine oil, axles oil, manual and automatic transmission oil. Changing break fluid in 1998 GMC Trucks T-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 1998 GMC Trucks T-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 1998 GMC Trucks T-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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Another years GMC Trucks T-Series oil capacities

• GMC Trucks T-Series 1997 oil capacities
• GMC Trucks T-Series 2001 oil capacities
• GMC Trucks T-Series 2002 oil capacities