Maintenance and Fluid Information for 2003 GMC C7500 Topkick 207/210/230/250/275/300 HP Caterpillar C7
If you are planning an oil change on a 2003 GMC C7500 Topkick 207/210/230/250/275/300 HP Caterpillar C7, the product lookup gives you two useful starting points: the engine-oil grades listed are 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. Before buying oil, confirm that the product also meets the applicable manufacturer specification.
When should I change the oil in my 2003 GMC C7500 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.
What synthetic oil options are available for my 2003 GMC C7500 Topkick 207/210/230/250/275/300 HP Caterpillar C7?
Synthetic engine-oil listings for this vehicle include 15W-40, 10W-30. A synthetic listing does not by itself mean the vehicle manufacturer requires full synthetic oil.
What is the oil filter part number for my 2003 GMC C7500 Topkick 207/210/230/250/275/300 HP Caterpillar C7?
The oil-filter part numbers listed for this vehicle include EAHD3191-EA, P551807-EA.

