Maintenance and Fluid Information for 2002 GMC T6500 Isuzu 6HK1
For the 2002 GMC T6500 Isuzu 6HK1, 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, Heavy-Duty Synthetic Diesel Oil 5W-40, Signature Series Max-Duty Synthetic Diesel Oil 15W-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.
How do I find the correct oil-change interval for my 2002 GMC T6500 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.
What synthetic oil options are available for my 2002 GMC T6500 Isuzu 6HK1?
Synthetic engine-oil listings for this vehicle include 15W-40, 5W-40. A synthetic listing does not by itself mean the vehicle manufacturer requires full synthetic oil.
What is the oil filter part number for my 2002 GMC T6500 Isuzu 6HK1?
The oil-filter part numbers listed for this vehicle include P559128-EA.

