How much oil does a 1991 Chevy G20 take?
The capacity depends on the engine installed. The 1991 G20 vans with the 4.3L V6 take about 4.5 quarts of oil with a filter, while models equipped with the 5.0L or 5.7L V8 typically require about 6 quarts with a filter.
Engine options and oil capacity
The following are the common engine configurations for the 1991 G20 and their approximate oil capacities, including the filter.
- 4.3L V6 — approximately 4.5 quarts (with filter)
- 5.0L V8 — approximately 6 quarts (with filter)
- 5.7L V8 — approximately 6 quarts (with filter)
Note: Capacity can vary slightly by exact engine setup and whether you replace the filter; always check the dipstick after filling to the correct level.
Oil type and change intervals
Use conventional 5W-30 in moderate climates; in hotter climates, 10W-30 may be appropriate. For severe conditions or older engines, some drivers opt for 5W-40. Follow GM's recommended change interval, typically every 3,000–6,000 miles depending on driving conditions and oil type. Always consult the owner's manual or a GM service bulletin for your exact vehicle.
Practical tips for checking and changing oil
Before performing any oil service, ensure the engine is cool and on level ground. Gather the correct filter and the oil capacity, pour slowly, recheck volume with the dipstick, and replace the drain plug with a new gasket if needed. After adding oil, run the engine to circulate oil, then re-check level and adjust to the full mark.
Summary
The 1991 Chevy G20’s oil capacity depends on the installed engine: about 4.5 quarts for the 4.3L V6, and about 6 quarts for the 5.0L or 5.7L V8. Always verify with the dipstick after adding oil and refer to the owner’s manual for the exact specification and recommended oil type for your vehicle.
