Make sure this part fits

GM 12591866 Main Seal

1987-2023 GM

Customer Questions & Expert Answers (2)
12591866 GM Main Seal Product Photo 1 of 4
  • Part Description
    Seal, Engine Rear Main Bearing
  • Position
    Rear
  • Replaces
    90298408, 90325572, 90280462, 90354378
  • Manufacturer
    General Motors
Make sure this part fits
$22.48 MSRP: $38.12
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  • Related Parts
  • Specifications
  • Fitment
  • Q&A
  • Product Specifications

    BrandGenuine GM
    Manufacturer Part Number12591866
    Part DescriptionMain Seal; Seal, Engine Rear Main Bearing
    Item Dimensions4.5 x 4.4 x 1.1 inches
    Item Weight0.30 Pounds
    PositionRear
    ConditionNew
    Fitment TypeDirect Replacement
    Replaces90298408, 90325572, 90280462, 90354378
    ManufacturerGeneral Motors
    SKU12591866
    WarrantyThis genuine GM part is guaranteed by GM's factory warranty.
    Shipping & ReturnShipping Policy Return Policy
    Warning: California's Proposition 65
  • Vehicle Fitment

    Year Make Model Engine Important vehicle option details
    2010-2015 Buick Allure4 Cyl 2.4LCX 4 DOOR SEDAN, CXL 4 DOOR SEDAN
    2016-2020 Buick Envision4 Cyl 2.0L, 4 Cyl 2.5L4 DOOR BASE, 4 DOOR PREMIUM, 4 DOOR PREMIUM 2, 4 DOOR UPLEVEL
    2018-2019, 2010-2016 Buick LaCrosse4 Cyl 2.4L, 4 Cyl 2.5L4 DOOR CX EXT NOTCHBACK, 4 DOOR CXL EXT NOTCHBACK, CX 4 DOOR SEDAN, CXL 4 DOOR SEDAN
    2011-2020 Buick Regal4 Cyl 2.0L, 4 Cyl 2.4L1SC 4 DOOR HATCHBACK, 1SL 4 DOOR HATCHBACK, 1SL 4 DOOR STATION WAGON, BASE 4 DOOR HATCHBACK, BASE 4 DOOR STATION WAGON, CX 4 DOOR SEDAN, CXL 4 DOOR SEDAN, CXL TURBO 4 DOOR SEDAN, CXS 4 DOOR SEDAN
    1987-1988 Buick Skyhawk4 Cyl 2.0L2 DOOR, 4 DOOR, CUSTOM 2 DOOR NOTCHBACK, CUSTOM 4 DOOR, CUSTOM STATION WAGON, LIMITED 2 DOOR, LIMITED 4 DOOR, LIMITED WAGON, SPORT 2 DOOR, STATION WAGON
    2012-2017 Buick Verano4 Cyl 2.0L, 4 Cyl 2.4LCX 4 DOOR NOTCHBACK, CXL 4 DOOR NOTCHBACK
    2013-2019 Cadillac ATS4 Cyl 2.0L, 4 Cyl 2.5L2 DOOR COUPE, 2 DOOR LUXURY COUPE, 2 DOOR PERFORMANCE COUPE, 3 DOOR PREMIUM COUPE, 4 DOOR LUXURY SEDAN, 4 DOOR PERFORMANCE SEDAN, 4 DOOR PREMIUM SEDAN, 4 DOOR SEDAN
    1997-2001 Cadillac Catera6 Cyl 3.0L4 DOOR, CATERA
    2016-2019 Cadillac CT64 Cyl 2.0L4 DOOR SEDAN, BASE 4 DOOR SEDAN, PREMIUM 4 DOOR SEDAN
    2014-2019, 2003-2004 Cadillac CTS4 Cyl 2.0L, 6 Cyl 3.2L, 6 Cyl 3.6L4 DOOR, 4 DOOR PERFORMANCE SEDAN, 4 DOOR PLUS SEDAN, 4 DOOR PREMIUM SEDAN, 4 DOOR RHD, 4 DOOR SEDAN, 4 DOOR(RHD), V 4 DOOR
    View More
  • 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 12591866 fits your vehicle.
    Posted and answered by GM Parts Specialist Julian
    Q:
    How to replace a one-piece rear Crankshaft Seal on Chevrolet HHR? Posted by Grigori M.
    A:
    The one-piece rear crankshaft seal is pressed into the engine block and the crankcase reinforcement section. Remove the transaxle, the clutch components, if equipped, and the flywheel. Pry out the old seal with a special seal removal tool or a flat-blade screwdriver. Caution: To prevent an oil leak after the new seal is installed, be very careful not to scratch or otherwise damage the crankshaft sealing surface or the bore in the engine block. Clean the crankshaft and seal bore in the block thoroughly and degrease these areas by wiping them with a rag soaked in lacquer thinner or acetone. Lubricate the lip of the new seal and the outer diameter of the crankshaft with engine oil. Position the new seal onto the crankshaft. Make sure the edges of the new oil seal are not rolled over. Note: When installing the new seal, if so marked, the words THIS SIDE OUT on the seal must face out, toward the rear of the engine. Use a special rear crankshaft seal installation tool or a socket with the exact diameter of the seal to drive the seal in place. Make sure the seal is not off-set; it must be flush along the entire circumference of the engine block and the crankcase reinforcement section. The remainder of installation is the reverse of removal.
    You can Select Your Vehicle to see complete installation and repair tips.
    Answered by GM Parts Specialist Jeremy / Dec 09, 2025

Genuine GM Part 12591866, the Right Choice

To ensure reliability, purchase GM part # 12591866 Main Seal. It is sometimes referred to as GM Crankshaft Seal. 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 Cadillac ATS, CT6, CTS models. It fits Chevrolet Blazer, Camaro, Equinox. It also fits GMC Acadia, Canyon, Terrain. This also fits Saturn L300, LW200, LW300.

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