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.

1990 Audi 100 Base, AutomaticFACTORY OEM SERVICE PROCEDURE

Compression Specifications - 4-Cylinder

COMPRESSION SPECIFICATIONS - 4-CYLINDER

Application		Specification
Compression Ratio		10.4:1
Compression Pressure
Normal (New Engine)		152-196 psi (10.7-13.7 kg/cm² )
Minimum		109 psi (7.7 kg/cm² )
Maximum Variation Between Cylinders		44 psi (3 kg/cm² )

Chapter Navigation

Return to Chapter: Engine Compression

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.

Shop Manual-Ready Tools Compare Repair Quote Quote Shield Pro

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.