Maintenance and Fluid Information for 2009 GMC T6500 Isuzu 6HK1
If you are planning an oil change on a 2009 GMC T6500 Isuzu 6HK1, the product lookup gives you two useful starting points: the engine-oil grades listed are 15W-40 and 5W-40. 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. Before buying oil, confirm that the product also meets the applicable manufacturer specification.
Which oil filter is listed for my 2009 GMC T6500 Isuzu 6HK1, and what is the filter number?
The oil-filter part numbers listed for this vehicle include P559128-EA.
What synthetic oil options are available for my 2009 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.
When should I change the oil in my 2009 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.

