Maintenance and Fluid Information for 2003 GMC C7500 Topkick 207/210/230/250/275/300 HP Isuzu 6HK1
An oil change on the 2003 GMC C7500 Topkick 207/210/230/250/275/300 HP 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.
Which oil filter is listed for my 2003 GMC C7500 Topkick 207/210/230/250/275/300 HP Isuzu 6HK1, and what is the filter number?
The oil-filter part numbers listed for this vehicle include P559128-EA.
What type of motor oil does my 2003 GMC C7500 Topkick 207/210/230/250/275/300 HP Isuzu 6HK1 use?
15W-40, 5W-40 is the engine-oil viscosity listed for this vehicle.
Does severe driving affect oil-change timing for my 2003 GMC C7500 Topkick 207/210/230/250/275/300 HP 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.

