GFB SV52 High Flow BOV - Rated at Over 300psi (Suits All High Powered Turbo or Supercharged Engines)

GFB SV52 High Flow BOV - Rated at Over 300psi (Suits All High Powered Turbo or Supercharged Engines)

Marsoni

M251S

$147.82

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

GFB SV52 High Flow BOV - Rated at Over 300psi (Suits All High Powered Turbo or Supercharged Engines)Strength and reliability is the primary factor, something that a diaphragm simply cannot match in a high boost BOV environment. Diaphragms have their place (we use them in our wastegates), as they offer low friction and good sealing capability. However, a rolling diaphragm is only designed to receive a net pressure on one side, which essentially "inflates" it against the walls of the chamber in which it resides, exactly how it is used in a wastegate

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I have been boating my whole life, this is by far the best gear oil. I use this in my Johnson 115 even though this is technically made by Mercury. I seem to get less if any water intrusion into my gearcase with this oil. If there is any, the oil emulsifies the water and continues to protect the gears. I have had better luck with this than Pennzoil marine or others. Highly recommend. It is a blue color and easy to drain and fill.

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Reviewed in the United States on March 23, 2026

Verified Purchase

Debra

Belleville, US

★★★★★ 5

Great

Size: 32 oz, Style: 32 Fl Oz, Pattern Name: Lube

Great lube for the boat

WAS THIS REVIEW HELPFUL?YesReportShare

Reviewed in the United States on May 19, 2026