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The available engine options for the A8 are:
- A.T. (trans code "GQF")
- 6.0L (VIN R, 5th digit)
- 4.2L (VIN V, 5th digit)
- VIN model "E" (8th digit) 4.2L (VIN L, 5th digit)
- VIN model "D" (8th digit) 4.2L (VIN L, 5th digit)
- A.T. 12 cyl (trans code "HLM")
- A.T. 8 cyl (trans code "HHV")
- A.T. VIN model "E" (8th digit) (trans code "GQF")
- A.T. VIN model "D" (8th digit) trans code "FUN"
- A.T. VIN model "D" (8th digit) trans code "FBF"
- A.T. trans code "FUN"
- A.T. trans code "FBF"
- 4.2L (VIN "G")
- 3.7L (VIN "F")
- 4.2L (VIN L, 5th digit)
- 4.2L (VIN L, 5th digit) (eng ID BFM)
- 6.0L (VIN R, 5th digit) eng ID BSB
- 4.2L (VIN L, 5th digit) eng ID BGK
- 4.2L (VIN L, 5th digit) eng ID BFM
- (4.2L, VIN V, 5th digit)
- A.T. exc. Quattro
- A.T. Quattro 3/97 thru 7/97 (code "DTE")
- A.T. Quattro 12/96 thru 2/97 (code "DSM")
- A.T. Quattro 9/96 thru 11/96 (code "DPZ")
- A.T. Quattro
- A.T. (Quattro, trans code "EDG")
- A.T. 12 cyl (trans code "JBU")
- A.T. 12 cyl (trans code "HKV")
- A.T. 8 cyl (trans code "HKT")
- A.T. 6.0L
- A.T. 4.2L
- A.T. (4.2L) ID LWJ
- A.T. (4.2L) ID HKM, HNM

