What is the coolant of the 2007 GMC Topkick?

C6/C7/C8 Manual Transmission, 7.2L L6 Engine: 30.4 qt (capacity); C6/C7/C8 Manual Transmission, 7.2L L6 Engine with A/C and Increased Cooling: 33.9 qt (capacity); C6/C7/C8 Manual Transmission, Isuzu 6H Engine (207–275 hp): 32.7 qt (capacity); C6/C7/C8 Manual Transmission, Isuzu 6H Engine (207–275 hp) with A/C and Increased Cooling: 35.9 qt (capacity); C6/C7/C8 Manual Transmission, Isuzu 6H Engine (300 hp), with or without A/C and Increased Cooling: 36.0 qt (capacity); C6/C7/C8 Manual Transmission, 8.1L V8 Engine: 33.3 qt (capacity); C6/C7/C8 Manual Transmission, 8.1L V8 Engine with A/C and Increased Cooling: 34.9 qt (capacity). Source: 2007 GMC Topkick Owner's Manual.

2007 GMC Topkick Coolant

2007 GMC Topkick coolant for each version, from the owner's manual with page references. Values differ by version; see each version.

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Depends on your version. Choose yours, or compare them here.

C6/C7/C8 Manual Transmission, 7.2L L6 Engine 30.4 qt capacity
C6/C7/C8 Manual Transmission, 7.2L L6 Engine with A/C and Increased Cooling 33.9 qt capacity
C6/C7/C8 Manual Transmission, Isuzu 6H Engine (207–275 hp) 32.7 qt capacity
C6/C7/C8 Manual Transmission, Isuzu 6H Engine (207–275 hp) with A/C and Increased Cooling 35.9 qt capacity
C6/C7/C8 Manual Transmission, Isuzu 6H Engine (300 hp), with or without A/C and Increased Cooling 36.0 qt capacity
C6/C7/C8 Manual Transmission, 8.1L V8 Engine 33.3 qt capacity
C6/C7/C8 Manual Transmission, 8.1L V8 Engine with A/C and Increased Cooling 34.9 qt capacity

2007 GMC Topkick Owner's Manual, PDF page 377

7.2L L6 Engine 30.4 qtOpen the manual at this page ↗Added Oct 21, 2026 · Updated Oct 22, 2026

See where it's printed

Coolant (capacity) · C6/C7/C8 Manual Transmission, 7.2L L6 Engine · PDF page 377
7.2L L6 Engine 30.4 qt

Coolant (capacity) · C6/C7/C8 Manual Transmission, 7.2L L6 Engine with A/C and Increased Cooling · PDF page 377
7.2L L6 Engine with A/C and Increased Cooling 33.9 qt

Coolant (capacity) · C6/C7/C8 Manual Transmission, Isuzu 6H Engine (207–275 hp) · PDF page 377
Isuzu 6H Engine (207–275 hp) 32.7 qt

Coolant (capacity) · C6/C7/C8 Manual Transmission, Isuzu 6H Engine (207–275 hp) with A/C and Increased Cooling · PDF page 377
Cooling 35.9 qt

Coolant (capacity) · C6/C7/C8 Manual Transmission, Isuzu 6H Engine (300 hp), with or without A/C and Increased Cooling · PDF page 377
Isuzu 6H Engine (300 hp) 36.0 qt

Coolant (capacity) · C6/C7/C8 Manual Transmission, 8.1L V8 Engine · PDF page 377
8.1L V8 Engine 33.3 qt

Coolant (capacity) · C6/C7/C8 Manual Transmission, 8.1L V8 Engine with A/C and Increased Cooling · PDF page 377
8.1L V8 Engine with A/C and Increased Cooling 34.9 qt

All versions

7 values

Applies to	Value	Manual says	Page
C6/C7/C8 Manual Transmission, 7.2L L6 Engine	30.4 qtcapacity	“7.2L L6 Engine 30.4 qt”	PDF page 377 ↗
C6/C7/C8 Manual Transmission, 7.2L L6 Engine with A/C and Increased Cooling	33.9 qtcapacity	“7.2L L6 Engine with A/C and Increased Cooling 33.9 qt”	PDF page 377 ↗
C6/C7/C8 Manual Transmission, Isuzu 6H Engine (207–275 hp)	32.7 qtcapacity	“Isuzu 6H Engine (207–275 hp) 32.7 qt”	PDF page 377 ↗
C6/C7/C8 Manual Transmission, Isuzu 6H Engine (207–275 hp) with A/C and Increased Cooling	35.9 qtcapacity	“Cooling 35.9 qt”	PDF page 377 ↗
C6/C7/C8 Manual Transmission, Isuzu 6H Engine (300 hp), with or without A/C and Increased Cooling	36.0 qtcapacity	“Isuzu 6H Engine (300 hp) 36.0 qt”	PDF page 377 ↗
C6/C7/C8 Manual Transmission, 8.1L V8 Engine	33.3 qtcapacity	“8.1L V8 Engine 33.3 qt”	PDF page 377 ↗
C6/C7/C8 Manual Transmission, 8.1L V8 Engine with A/C and Increased Cooling	34.9 qtcapacity	“8.1L V8 Engine with A/C and Increased Cooling 34.9 qt”	PDF page 377 ↗

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Original sourcePDF page 377

2007 GMC Topkick Owner's Manual