Engine Identification

1999 Buick Regal LSSECTION Engine Identification

Engine can be identified by eighth character of Vehicle Identification Number (VIN) which is stamped on a metal pad located near lower left corner of windshield. See ENGINE IDENTIFICATION CODESΒ  table. "W" in the tenth character of the VIN indicates 1998 model year, and "X" indicates 1999 model year.

Engine can also be identified by a 3-character engine code (RPO code). See ENGINE IDENTIFICATION CODESΒ  table. This code may be stamped on engine. See Fig 1.

Fig 1: Locating Engine Codes
G91E08084Courtesy of GENERAL MOTORS CORP.
ENGINE IDENTIFICATION CODES

Engine Code
3.8L SFI
8th Character Of Dash VIN K
Engine Code (RPO Code) L36
3.8L SFI Supercharged
8th Character Of Dash VIN 1
Engine Code (RPO Code) L67
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.