❄️Coolant Type
Buick Regal Coolant Type
Find the correct coolant type, color, and capacity for your Buick Regal. Covers all years with flush intervals and mixing compatibility.
Factory Manual ConfirmationCoolant Type
Buick Regal Coolant Type
The Buick Regal uses manufacturer-specific coolant — typically long-life OAT or HOAT formula. Never mix different coolant types. Check the year breakdown below for your specific coolant color and capacity.
Fluid type and capacity can change by engine, drivetrain, and transmission. Verify the exact branch before filling anything.
Exact Vehicle Check
Use the archive navigator when you need the exact engine, trim, or production-branch manual instead of a broad year-range summary.
2003-2008
Representative 2003 manual branch for 2003-2008
A L L Diagnostic Trouble Codes ( DTC )
Regal V6-3.8L SC VIN 1
A L L Diagnostic Trouble Codes ( DTC ) — 2003 Buick Regal V6-3.8L SC VIN 1 Service Manual | Operation CHARM Operation CHARM : Car repair manuals for everyone. Home >> Buick >> 2003 >>...
Open factory section →A L L Diagnostic Trouble Codes ( DTC )
Regal V6-3.8L VIN K
A L L Diagnostic Trouble Codes ( DTC ) — 2003 Buick Regal V6-3.8L VIN K Service Manual | Operation CHARM Operation CHARM : Car repair manuals for everyone. Home >> Buick >> 2003 >> Reg...
Open factory section →2015-2020
2015-2020Coolant TypeOAT or HOAT (long-life)
Coolant ColorPink, blue, or orange (manufacturer-specific)
Total Capacity6.0 - 10.0 quarts (varies by engine)
Drain & Fill Volume3.0 - 5.0 quarts
Change Interval100,000 miles or 10 years (first), then every 50,000
Concentration50/50 pre-mixed or concentrate mixed 50/50 with distilled water
Notes
- →NEVER mix different coolant types or colors — flush completely when changing brands
- →Always use distilled water, not tap water, when mixing coolant concentrate
- →Modern OAT/HOAT coolants last much longer than traditional green coolant
- →Check coolant level when engine is COLD — opening the radiator cap when hot causes severe burns
2009-2014
2009-2014Coolant TypeHOAT or IAT
Coolant ColorGreen, orange, or pink
Total Capacity6.0 - 10.0 quarts
Drain & Fill Volume3.0 - 5.0 quarts
Change Interval60,000 miles or 5 years
Concentration50/50 with distilled water
Notes
- →NEVER mix different coolant types or colors — flush completely when changing brands
- →Always use distilled water, not tap water, when mixing coolant concentrate
- →Check coolant level when engine is COLD — opening the radiator cap when hot causes severe burns
2003-2008
2003-2008Coolant TypeHOAT or IAT
Coolant ColorGreen, orange, or pink
Total Capacity6.0 - 10.0 quarts
Drain & Fill Volume3.0 - 5.0 quarts
Change Interval60,000 miles or 5 years
Concentration50/50 with distilled water
Notes
- →NEVER mix different coolant types or colors — flush completely when changing brands
- →Always use distilled water, not tap water, when mixing coolant concentrate
- →Check coolant level when engine is COLD — opening the radiator cap when hot causes severe burns
1997-2002
1997-2002Coolant TypeIAT (traditional green)
Coolant ColorGreen
Total Capacity6.0 - 10.0 quarts
Drain & Fill Volume3.0 - 5.0 quarts
Change Interval30,000 miles or 2 years
Concentration50/50 with distilled water
Notes
- →NEVER mix different coolant types or colors — flush completely when changing brands
- →Always use distilled water, not tap water, when mixing coolant concentrate
- →Check coolant level when engine is COLD — opening the radiator cap when hot causes severe burns
1991-1996
1991-1996Coolant TypeIAT (traditional green)
Coolant ColorGreen
Total Capacity6.0 - 10.0 quarts
Drain & Fill Volume3.0 - 5.0 quarts
Change Interval30,000 miles or 2 years
Concentration50/50 with distilled water
Notes
- →NEVER mix different coolant types or colors — flush completely when changing brands
- →Always use distilled water, not tap water, when mixing coolant concentrate
- →Check coolant level when engine is COLD — opening the radiator cap when hot causes severe burns
1985-1990
1985-1990Coolant TypeIAT (traditional green)
Coolant ColorGreen
Total Capacity6.0 - 10.0 quarts
Drain & Fill Volume3.0 - 5.0 quarts
Change Interval30,000 miles or 2 years
Concentration50/50 with distilled water
Notes
- →NEVER mix different coolant types or colors — flush completely when changing brands
- →Always use distilled water, not tap water, when mixing coolant concentrate
- →Check coolant level when engine is COLD — opening the radiator cap when hot causes severe burns
1979-1984
1979-1984Coolant TypeIAT (traditional green)
Coolant ColorGreen
Total Capacity6.0 - 10.0 quarts
Drain & Fill Volume3.0 - 5.0 quarts
Change Interval30,000 miles or 2 years
Concentration50/50 with distilled water
Notes
- →NEVER mix different coolant types or colors — flush completely when changing brands
- →Always use distilled water, not tap water, when mixing coolant concentrate
- →Check coolant level when engine is COLD — opening the radiator cap when hot causes severe burns
1973-1978
1973-1978Coolant TypeIAT (traditional green)
Coolant ColorGreen
Total Capacity6.0 - 10.0 quarts
Drain & Fill Volume3.0 - 5.0 quarts
Change Interval30,000 miles or 2 years
Concentration50/50 with distilled water
Notes
- →NEVER mix different coolant types or colors — flush completely when changing brands
- →Always use distilled water, not tap water, when mixing coolant concentrate
- →Check coolant level when engine is COLD — opening the radiator cap when hot causes severe burns
Frequently Asked Questions
- What type of coolant does a Buick Regal use?
- The Buick Regal coolant type depends on the model year. Newer models use long-life OAT or HOAT coolant (often pink, blue, or orange). Older models use traditional green IAT coolant. Never mix types — check the specs below for your year.
- How much coolant does a Buick Regal hold?
- The Buick Regal cooling system typically holds 6-10 quarts total. A drain-and-fill replaces about 50-60% of the coolant. For a full system flush, you'll need the complete capacity amount plus extra for bleeding.
- Can I mix coolant colors in my Buick Regal?
- No — mixing different coolant types can cause gel formation, clogged passages, and overheating. If you don't know what's in the system, do a complete flush before adding new coolant. Use only the manufacturer-specified type.
- How often should I change coolant in my Buick Regal?
- Modern Buick Regal models with long-life coolant can go 100,000 miles or 10 years before the first change, then every 50,000 miles. Older models with green coolant need changes every 30,000 miles or 2 years.
Buick Regal Repair Guides
More Buick Regal Guides
Browse all Coolant Type pages →🔋Buick Regal Battery Location🧪Buick Regal Fluid Capacities💡Buick Regal Headlight Bulb Size🛢️Buick Regal Oil Type & Capacity⚙️Buick Regal Serpentine Belt⚡Buick Regal Spark Plug Type❄️Toyota 4Runner Coolant Type❄️Toyota Avalon Coolant Type❄️Toyota Camry Coolant Type❄️Toyota Celica Coolant Type❄️Toyota Corolla Coolant Type❄️Toyota Echo Coolant Type❄️Toyota Highlander Coolant Type❄️Toyota Land Cruiser Coolant Type❄️Toyota Matrix Coolant Type