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Buick 12539086 Piston Assembly

1996-2005 Buick

Customer Questions & Expert Answers (3)
12539086 GM Piston Assembly Illustration 1 of 1
  • Part Description
    Piston, Engine Piston
  • Manufacturer
    General Motors
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  • Related Parts
  • Specifications
  • Fitment
  • Q&A
  • Product Specifications

    BrandGenuine Buick
    Manufacturer Part Number12539086
    Part DescriptionPiston Assembly; Piston, Engine Piston
    Item Dimensions4.8 x 4.6 x 4.6 inches
    Item Weight1.50 Pounds
    ConditionNew
    Fitment TypeDirect Replacement
    Require Quantity6
    ManufacturerGeneral Motors
    SKU12539086
    Shipping & ReturnShipping Policy Return Policy
    Warning: California's Proposition 65
  • Vehicle Fitment

    Year Make Model Engine Important vehicle option details
    1996-2005 Buick Park Avenue6 Cyl 3.8LPARK AVENUE, ULTRA
    1997-2004 Buick Regal6 Cyl 3.8LCUSTOM, GS, LIMITED, LS, REGAL
    1996-1999 Buick Riviera6 Cyl 3.8LRIVIERA
  • Customer Questions & Expert Answers

    Q:
    I'm wondering if this is complete and correct part for my vehicle.
    A:
    You can Select Your Vehicle to check if 12539086 fits your vehicle.
    Posted and answered by GM Parts Specialist Julian
    Q:
    How should the new upper bearing insert be installed in the connecting rod and Piston for the 1999 Pontiac Grand Prix? Posted by Hali M.
    A:
    Clean the back side of the new upper bearing insert and place it in the connecting rod, ensuring the tab fits into the recess without hammering it in. You can Select Your Vehicle to see complete installation and repair tips.
    Answered by GM Parts Specialist Bob / Sep 01, 2025
    Q:
    How can carbon deposits be eliminated from the Piston ring grooves for the 1999 Pontiac Grand Prix? Posted by Skylar Y.
    A:
    A piston ring groove cleaning tool should be used to eliminate carbon deposits from the ring grooves. Alternatively, a piece broken off the old ring can serve the same purpose, but care must be taken not to remove any metal or damage the grooves. You can Select Your Vehicle to see complete installation and repair tips.
    Answered by GM Parts Specialist Raul / Mar 08, 2022

Genuine GM Part 12539086, the Right Choice

To ensure reliability, purchase GM part # 12539086 Piston Assembly. It is sometimes referred to as Buick Piston. Directly from GM, genuine parts are superb with regards to quality, longevity, and fit. Every single part passed stringent quality testing, so you can be sure that it's safe, durable, and built to perform like your original parts. This part fits specific Buick Park Avenue, Regal, Riviera models.

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