Maintenance and Fluid Information for 2008 GMC C6500 Topkick 200/210/230/250/275/300 HP Isuzu 6HK1
For the 2008 GMC C6500 Topkick 200/210/230/250/275/300 HP 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.
Which oil filter is listed for my 2008 GMC C6500 Topkick 200/210/230/250/275/300 HP Isuzu 6HK1, and what is the filter number?
The oil-filter part numbers listed for this vehicle include P559128-EA.
When should I change the oil in my 2008 GMC C6500 Topkick 200/210/230/250/275/300 HP 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 type of motor oil does my 2008 GMC C6500 Topkick 200/210/230/250/275/300 HP Isuzu 6HK1 use?
15W-40, 5W-40 is the engine-oil viscosity listed for this vehicle.

