What type of oil does a 1991 Audi 90 take?

The 1991 Audi 90 requires API - SAE 5W-20/30 (Below -15Deg.F to 20Deg.F), 10W-30/40 (-5Deg.F to 65Deg.F), 15W-40/50 (10Deg.F to Above 85Deg.F), 20W-40/50 (15Deg.F to Above 85Deg.F). The exact spec may vary slightly by engine variant — this page shows the OEM recommendation for the Base, 2.3 C configuration.

How much oil does a 1991 Audi 90 need?

The 1991 Audi 90 takes 3.70 QTS. (3.5 L) of engine oil with the filter replaced.

What happens if I use the wrong oil in my 1991 Audi 90?

Using oil that does not meet the API - SAE 5W-20/30 (Below -15Deg.F to 20Deg.F), 10W-30/40 (-5Deg.F to 65Deg.F), 15W-40/50 (10Deg.F to Above 85Deg.F), 20W-40/50 (15Deg.F to Above 85Deg.F) specification can reduce engine protection, increase wear, and potentially void warranty coverage. Always use oil that meets the OEM spec.

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.

1991 Audi 90Oil Type & Capacity

OEM spec from the factory service manual for the Base, 2.3 C variant.

Quick Answer

Oil Type

$API - SAE 5W-20/30 (Below -15Deg.F to 20Deg.F), 10W-30/40 (-5Deg.F to 65Deg.F), 15W-40/50 (10Deg.F to Above 85Deg.F), 20W-40/50 (15Deg.F to Above 85Deg.F)

Capacity (w/ Filter)

3.70 QTS.

3.5 L

Variant

Base, 2.3 C

Note: Difference between "min" and "max" marks on dipstick is approx. 1.qt.

This vehicle's factory manual

The oil spec is above. This opens the fluids section of the 1991 Audi 90 Base, 2.3 C factory book.

Open the 1991 Audi manual

Sister site: See this spec on WhatTypeOfOil.com — our quick oil type & capacity lookup for every vehicle.

Other specs:All specs

What You'll Need

Engine Oil

$API - SAE 5W-20/30 (Below -15Deg.F to 20Deg.F), 10W-30/40 (-5Deg.F to 65Deg.F), 15W-40/50 (10Deg.F to Above 85Deg.F), 20W-40/50 (15Deg.F to Above 85Deg.F) for Audi 90

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Frequently Asked Questions

What type of oil does a 1991 Audi 90 take?: The 1991 Audi 90 requires API - SAE 5W-20/30 (Below -15Deg.F to 20Deg.F), 10W-30/40 (-5Deg.F to 65Deg.F), 15W-40/50 (10Deg.F to Above 85Deg.F), 20W-40/50 (15Deg.F to Above 85Deg.F). The exact spec may vary slightly by engine variant — this page shows the OEM recommendation for the Base, 2.3 C configuration.
How much oil does a 1991 Audi 90 need?: The 1991 Audi 90 takes 3.70 QTS. (3.5 L) of engine oil with the filter replaced.
Can I use synthetic oil in my 1991 Audi 90?: Yes — synthetic oil that meets the API - SAE 5W-20/30 (Below -15Deg.F to 20Deg.F), 10W-30/40 (-5Deg.F to 65Deg.F), 15W-40/50 (10Deg.F to Above 85Deg.F), 20W-40/50 (15Deg.F to Above 85Deg.F) specification is acceptable and often preferred for better protection and longer change intervals.
What happens if I use the wrong oil in my 1991 Audi 90?: Using oil that does not meet the API - SAE 5W-20/30 (Below -15Deg.F to 20Deg.F), 10W-30/40 (-5Deg.F to 65Deg.F), 15W-40/50 (10Deg.F to Above 85Deg.F), 20W-40/50 (15Deg.F to Above 85Deg.F) specification can reduce engine protection, increase wear, and potentially void warranty coverage. Always use oil that meets the OEM spec.