Mercury 135 - 200 Hp Bottom Guided Port Piston Kit 100-19PK OE 785-9737T4, 9737T

Mercury 135 - 200 Hp Bottom Guided Port Piston Kit 100-19PK OE 785-9737T4, 9737T

Marsoni

M251S

$128.74

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

Mercury 135 - 200 Hp Bottom Guided Port Piston Kit 100-19PK OE 785-9737T4, 9737TSizes Available: Part#: PK Port Side SK Starboard Std. 100 19 PK or SK . 010 100 19 04 PK or SK . 015 100 19 045 PK or SK . 020 100 19 05 PK or SK . 030 100 19 06 PK or SK . 040 100 19 07 PK or SK Please Make A Note On Invoice Or MESSAGE With Part # and Size. ITEM#: 100 19 07SK PISTON KIT MERCURY MARINER 135 200 HP 90 91 STARBOARD . 040 OVER 3. 540" bottom guided BRAND: WSM FITMENTS: Make Model Year(s) Mariner ALL Mercury 6 Cyl 3. 125 Bore 2L 135 1990

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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

Verified Purchase

Cooch

Houston, US

★★★★★ 5

Best synthetic oil BMW

Excellent synthetic oil BMW 328I

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Reviewed in the United States on February 6, 2026

Verified Purchase

Malu buys everything

Carnegie, US

★★★★★ 5

Last long

Love it ! Since I have a BMW this oil it’s good for it . The Price is good . Last long . No engine noise Or oil burning. Even the color looks good after 3 months.

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Reviewed in the United States on March 9, 2026

Verified Purchase

Brian Classen

Massapequa, US

★★★★★ 5

FRIENDLY REMINDER Don't overtighten the bolts

MUCH better than the cheap plastic OEM part, Just a reminder though, these thread into an aluminum block so be very careful to start them finger tight first, then evenly tighten both bolts to push the fitting into the chamber. If you don't, it will slightly misalign and you run the risk of stripping the threads. The one comes with the replacement o ring, and be sure to get some antifreeze on that seal prior to attempting to push it into the chamber. IT IS A TIGHT FIT, but that's what you want, so just be careful. You might also want an extra hose clamp on hand, as the one that came with this began to bend as it got tight, so I had to replace it for peace of mind. Overall, great product though.

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Reviewed in the United States on January 9, 2026

Verified Purchase

Dklnyc

Charlottesville, US

★★★★★ 5

Strong product

Great quality

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Reviewed in the United States on March 11, 2026