Maintenance and Fluid Information for 2005 GMC T7500 Isuzu 6HK1
If you are planning an oil change on a 2005 GMC T7500 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 2005 GMC T7500 Isuzu 6HK1, and what is the filter number?
The oil-filter part numbers listed for this vehicle include P559128-EA.
What oil weight does my 2005 GMC T7500 Isuzu 6HK1 take?
The engine-oil viscosities listed for this vehicle are 15W-40, 5W-40.
How do I find the correct oil-change interval for my 2005 GMC T7500 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.

