Maintenance and Fluid Information for 2003 GMC C6500 Topkick 207/210/230/250/275/300 HP Caterpillar C7
An oil change on the 2003 GMC C6500 Topkick 207/210/230/250/275/300 HP Caterpillar C7 starts with selecting the right lubricant. The catalog lists these engine-oil viscosity grades: 15W-40 and 10W-30. The matching product listings include Heavy-Duty Synthetic Diesel Oil 15W-40, Heavy-Duty Synthetic Diesel Oil 10W-30, 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 is the oil filter part number for my 2003 GMC C6500 Topkick 207/210/230/250/275/300 HP Caterpillar C7?
The oil-filter part numbers listed for this vehicle include EAHD3191-EA, P551807-EA.
What type of oil does my 2003 GMC C6500 Topkick 207/210/230/250/275/300 HP Caterpillar C7 take?
15W-40, 10W-30 is the engine-oil viscosity listed for this vehicle.
When should I change the oil in my 2003 GMC C6500 Topkick 207/210/230/250/275/300 HP Caterpillar C7?
Use the manufacturer’s maintenance schedule for this engine and operating conditions. The available application data does not establish an exact oil-change interval.

