Audi AMB Service Manual page 436

ENGINE 1.8 Liter 4-Cyl. 5V Turbo Engine Mechanical, Engine Code(s): AMB
this use a piston without rings.
Piston ring Dimensions in mm
Compression ring 1
Compression ring 2
Oil scraper ring
Checking ring to groove clearance
Fig. 139: Checking Ring To Groove Clearance
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Clean groove before checking clearance.

Piston ring Dimensions in mm
Compression ring 1
Compression ring 2
Oil scraper ring
Checking piston
Fig. 140: Checking Piston
2005 Audi A4 Quattro
New
0.20...0.40
0.20...0.40
0.25...0.50
New
0.06...0.09
0.05...0.08
0.03...0.06
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Wear limit
0.8
0.8
0.8
Wear limit
0.20
0.20
0.15