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Make sure this part fits

Pontiac 12591866 Main Seal

1987-2010 Pontiac

Customer Questions & Expert Answers (2)
12591866 GM Main Seal Product Photo 1 of 4
12591866 GM Main Seal Product Photo 1 of 4
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12591866 GM Main Seal Illustration 1 of 1
  • 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
You Save: $15.64 (42%)
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  • Related Parts
  • Specifications
  • Fitment
  • Q&A

  • Related Parts

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  • Product Specifications

    BrandGenuine Pontiac
    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
    2007-2010 Pontiac G54 Cyl 2.2L, 4 Cyl 2.4L2 DOOR, 4 DOOR, GT 2 DOOR, GT 4 DOOR, LS 2 DOOR, LS 4 DOOR, SE 2 DOOR, SE 4 DOOR, SPORT 2 DOOR, SPORT 4 DOOR
    2006-2010 Pontiac G64 Cyl 2.4LGT 2 DOOR CONVERTIBLE, GT 2 DOOR NOTCHBACK, GT 4 DOOR NOTCHBACK, GTP 2 DOOR CONVERTIBL, GTP 2 DOOR NOTCHBACK, GXP 2 DOOR NOTCHBACK, GXP 4 DOOR NOTCHBACK, SE 4 DOOR NOTCHBACK, SE1 2 DOOR NOTCHBACK, SE1 4 DOOR NOTCHBACK
    2002-2005, 1987-1989 Pontiac Grand Am4 Cyl 2.0L, 4 Cyl 2.2L2 DOOR, 4 DOOR, GT 2 DOOR, GT 2 DOOR COUPE, GT 4 DOOR, GT1 2 DOOR, GT1 2 DOOR COUPE, GT1 4 DOOR, LE 2 DOOR, LE 4 DOOR, SE 2 DOOR, SE 4 DOOR, SE 4 DOOR SEDAN, SE1 2 DOOR, SE1 4 DOOR
    1989-1990 Pontiac LeMans4 Cyl 2.0L2 DOOR, 4 DOOR
    2005-2006 Pontiac Pursuit4 Cyl 2.0L, 4 Cyl 2.2L, 4 Cyl 2.4L2 DOOR, 4 DOOR, LEVEL 4 PERFORMANCE (SS) 2 DOOR, LEVEL 4 PERFORMANCE/SC (SS) 2 DOOR, LEVEL ONE (LS) 2 DOOR, LEVEL ONE (LS) 4 DOOR, LEVEL THREE (SS) 2 DOOR, LEVEL THREE (SS) 4 DOOR, LEVEL TWO (LT) 2 DOOR, LEVEL TWO (LT) 4 DOOR
    2006-2010 Pontiac Solstice4 Cyl 2.0L, 4 Cyl 2.4L2 DOOR CONVERTIBLE, 2 DOOR COUPE(TARGA), TURBO 2 DOOR CONVERTIBLE
    1987-1994 Pontiac Sunbird4 Cyl 2.0L2 DOOR, 4 DOOR, CONVERTIBLE, GT 2 DOOR, GT 4 DOOR, GT CONVERTIBLE, LE 2 DOOR, LE 4 DOOR, LE CONVERTIBLE, SE 2 DOOR, SE 2 DOOR NOTCHBACK, SE 2 DOOR PLAINBACK HATCHBACK, SE 4 DOOR, SE CONVERTIBLE, SE STATION WAGON, STATION WAGON
    2002-2005 Pontiac Sunfire4 Cyl 2.2L2 DOOR, 4 DOOR, GT 2 DOOR

  • 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 Pontiac 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 Pontiac G5, Grand Am, Pursuit models.

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