Standard Polypak® Rod/Piston U-Seal 0.437

Standard Polypak® Rod/Piston U-Seal 0.437" x 0.687" x 0.125" - AU/NBR

Marsoni

M251S

$13.00

Get it in 3 business days with 1 day shipping. Friday, May 29

Standard Polypak® Rod/Piston U-Seal 0.437" x 0.687" x 0.125" - AU/NBRProduct Details : Standard Polypak Rod Piston U Seal 0. 437" x 0. 687" x 0. 125" AU NBR Part No: 12500437 4615 Product Category: Symmetrical Seals Product Type: Rod Piston U Seal Profile: Standard Polypak Material(s): Polyurethane Nitrile Material Code: AU NBR Temperature Range: 65F to +200F ( 54C to +93C) Pressure Range: 5000 PSI ( 345 Bar) Surface Speed: < 1. 6 ft s (0. 5 m s) System Of Measurement: Inch Dimensions: 0. 437" x 0. 687" x 0. 125"

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I noticed the engine running much quieter using this oil. The pour mouth is pretty unique for this brand, you can just open the interior cap, pull up the accordion neck and pour into the engine which provides better control over traditional wide mouth, thus less messy. This oil rarely goes on sale and is typically 1.5x to 2x more expensive than the more common US brands.

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Reviewed in the United States on August 28, 2025

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Cooch

Bozeman, US

★★★★★ 5

Best synthetic oil BMW

Excellent synthetic oil BMW 328I

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Reviewed in the United States on February 6, 2026