Maintenance and Fluid Information for 2004 GMC T7500 Isuzu 6HK1
An oil change on the 2004 GMC T7500 Isuzu 6HK1 starts with selecting the right lubricant. The catalog lists these engine-oil viscosity grades: 15W-40 and 5W-40. The matching product listings include Heavy-Duty Synthetic Diesel Oil 15W-40, Heavy-Duty Synthetic Diesel Oil 5W-40, Signature Series Max-Duty Synthetic Diesel Oil 15W-40. The grade alone is not the whole specification, so check the manufacturer’s requirements before making your selection.
What kind of oil does my 2004 GMC T7500 Isuzu 6HK1 take?
15W-40, 5W-40 is the engine-oil viscosity listed for this vehicle.
What is the oil filter part number for my 2004 GMC T7500 Isuzu 6HK1?
The oil-filter part numbers listed for this vehicle include P559128-EA.
How do I find the correct oil-change interval for my 2004 GMC T7500 Isuzu 6HK1?
Use the manufacturer’s maintenance schedule for this engine and operating conditions. The available application data does not establish an exact oil-change interval.

