Quick Summary
Looking for the correct oil type for your 1991 Buick RIVIERA? According to factory specs, the 3.8L 6 -cyl Engine Code [L] L27 L requires 10W-30 viscosity oil. Using the right oil capacity of 4.5 QUARTS ensures engine longevity and fuel efficiency.
๐ข๏ธ 3.8L 6 -cyl Engine Code [L] L27 L
Verified Data
Capacity
4.5 QUART
Viscosity
10W-30
๐
Recommended Maintenance Products
Everything you need for a complete oil change
๐ข๏ธ
Motor Oil
Get the correct viscosity for your engine
Shop Now โโ๏ธ
Oil Filter
OEM or premium aftermarket options
Shop Now โ๐ง
Drain Plug Gasket
Replace every oil change - don't reuse!
Shop Now โ๐ฅฃ
Oil Drain Pan
Catch and store used oil safely
Shop Now โ๐ช๏ธ
Funnel Set
No-spill oil pouring
Shop Now โ๐งค
Mechanic Gloves
Keep your hands clean
Shop Now โโ ๏ธ
Common Trouble Codes for 1991 Buick RIVIERA
Get vehicle-specific repair guides for these codes