There are 4 choices

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2.4L (VIN C, 8th digit, opt LAF)
- California emissions
  - opt NU5
  - opt NU6
- Federal emissions (opt NT7)
3.6L (VIN D, 8th digit, opt LLT)

Engine Assembly for 2011 Buick Lacrosse

Fits: 3.6L VIN D, 8th digit, opt LLT (change)

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