Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2021 Buick Envision Avenir, AWDFACTORY OEM SERVICE PROCEDURE
Quick Lookups: Fluids
| FLUID CAPACITIES | |||||||
|---|---|---|---|---|---|---|---|
| Fluid Type | Application | Standard | Metric | Fluid Spec | Note | S/H | |
| Air Cond Compressor Oil | Total System | 2.00 OZS. | 0.05 L | PAG Oil | S | ||
| Air Cond Refrigerant | 1.54 LBS. | 0.69 KG | R-1234yf | For further details see "Air conditioner specification label". | S | ||
| Automatic Transmission Fluid | Drain Plug | N/A | N/A | Automatic Transmission Fluid DEXRON VI | Fluid Capacity is between: 5.3 - 6.3 qts. Approximate capacity. | S | |
| Automatic Transmission Fluid | Overhaul | N/A | N/A | Automatic Transmission Fluid DEXRON VI | Fluid Capacity is between: 9.0 - 10 qts. Approximate capacity. | S | |
| Automatic Transmission Fluid | Valve Body Cover Removal | N/A | N/A | Automatic Transmission Fluid DEXRON VI | Fluid Capacity is between: 2.1 - 3.2 qts. Approximate capacity. | S | |
| Brake Fluid | 0.98 QTS. | 0.92 L | DOT 4 Hydraulic Brake Fluid | S | |||
| Differential Gear Oil | Rear,Differential Clutch Fill | 0.37 QTS. | 0.35 L | Pentosin CHF - 11S | S | ||
| Differential Gear Oil | Rear,Differential Lubricant Fill | 0.92 QTS. | 0.87 L | DEXRON LS Hypoid Fluid | S | ||
| Engine Coolant | 9.90 QTS. | 9.36 L | 50/50 mixture of DEX-COOL and clean, drinkable water | After refill, the level must be checked. Add enough engine coolant so that the fluid is within the proper operating range. | S | ||
| Engine Oil | w/Filter | 5.28 QTS. | 4.99 L | API - SAE 0W-20 | ACDelco dexos1 gen 2 full synthetic engine oil. | S | |
| Fuel Tank | AWD | 16.30 GALS. | 61.7 L | S | |||
| Transfer Case Fluid | 0.69 QTS. | 0.65 L | Power Transfer Unit (PTU) AAM | S | |||
| Windshield Washer Fluid | 4.80 QTS. | 4.54 L | Windshield Washer Fluid | Follow the Manufacturer's Instructions for the mixture ratio. Automotive windshield washer fluid that meets regional freeze protection requirements. | S | ||
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.