Maintenance and Fluid Information for 2002 GMC Topkick B7 School Bus Caterpillar 3126
For the 2002 GMC Topkick B7 School Bus Caterpillar 3126, you will find 15W-40 and 5W-40 in the engine-oil listings. The matching product listings include Heavy-Duty Synthetic Diesel Oil 15W-40, Signature Series Max-Duty Synthetic Diesel Oil 15W-40, Signature Series Max-Duty Synthetic Diesel Oil 5W-40. 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 does my 2002 GMC Topkick B7 School Bus Caterpillar 3126 take and which oil filter is listed?
The listed engine-oil viscosity is 15W-40, 5W-40, and listed oil-filter part numbers include EAHD3191-EA, P551807-EA.
When should I change the oil in my 2002 GMC Topkick B7 School Bus Caterpillar 3126?
Use the manufacturer’s maintenance schedule for this engine and operating conditions. The available application data does not establish an exact oil-change interval.

