Maintenance and Fluid Information for 2003 GMC C7500 Topkick 207/210/230/250/275/300 HP Chevrolet/GMC Vortec V8
For the 2003 GMC C7500 Topkick 207/210/230/250/275/300 HP Chevrolet/GMC Vortec V8, you will find 5W-30 in the engine-oil listings. The matching product listings include Signature Series 5W-30 Synthetic Motor Oil, XL 5W-30 Synthetic Motor Oil, OE 5W-30 Synthetic Motor Oil. Those are product matches, not proof that every listed oil meets every requirement for this engine. Check the manufacturer’s oil specification before choosing one.
What oil and oil filter are listed for my 2003 GMC C7500 Topkick 207/210/230/250/275/300 HP Chevrolet/GMC Vortec V8?
The listed engine-oil viscosity is 5W-30, and listed oil-filter part numbers include EAO59-EA, P550507-EA, 57099-EA.
When should I change the oil in my 2003 GMC C7500 Topkick 207/210/230/250/275/300 HP Chevrolet/GMC Vortec V8?
Use the manufacturer’s maintenance schedule for this engine and operating conditions. The available application data does not establish an exact oil-change interval.

