Apollo Temperature and Pressure Relief Valve, 3,070,000 BtuH, 125 psi, 4 in Thermostat Length - 18C5314125

Apollo Temperature and Pressure Relief Valve, 3,070,000 BtuH, 125 psi, 4 in Thermostat Length - 18C5314125

Marsoni

M251S

$126.86

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

Apollo Temperature and Pressure Relief Valve, 3,070,000 BtuH, 125 psi, 4 in Thermostat Length - 18C5314125Temperature and Pressure Relief Valve; Inlet Type: MNPT; Outlet Type: FNPT; Inlet Size: 1 1 4 in; Outlet Size: 1 in; Thermostat Length: 4 in; Body Height: 10 1 4 in; BtuH: 3,070,000; Factory Set Pressure: 125 psi; Max. Temp.: 210 Degrees F; Shank Length: Standard; Auto Re Seating: Yes; Body Material: Bronze; Spring Material: Stainless Steel; Body Width: 1 3 4 in; Standards: Certified ANSI Z21. 22 And CSA 4. 4, Listed By ASME And CSA

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I've been using this mobile one in my 2005 Mercedes kompressor C230 w203 1.8 engine for about 18 years and never had a problem so I will continue to use it. The price was very good compared to other places but I did have to order one extra quart, I don't know why they don't make this mobile one in a six quart jug.

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Reviewed in the United States on May 1, 2026

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rpeters

Grantham, US

★★★★★ 5

Great for my hot rod!

Size: 5 Quart, Style: Full Synthetic, Configuration: 0W-40

Perfect oil for my hot rod! Add a bottle of zinc and you get great low temp flow as well as good heat protection. As a 0W it flows quickly for good start up protection and the 40W means I get good protection as temps rise. My car has a flat tappet hydraulic cam so I add a bottle of zinc. Has worked great!

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Reviewed in the United States on March 19, 2026

Verified Purchase

Evan C. Lombardi

Houston, US

★★★★★ 5

European oil… Japanese engine… zero regrets 🇪🇺➡️🇯🇵

Size: 5 Quart, Style: Full Synthetic, Configuration: 0W-40, Size: 5 Quart, Style: Full Synthetic, Configuration: 0W-40

Yes, I know what the label says. “European Car Formula.” Yes, I put it in a 2002 Subaru WRX bugeye with an EJ257 block and EJ205 heads. And yes—this oil absolutely slaps. This engine is not stock, not delicate, and definitely not living an easy life. It sees spirited driving, boost, and the occasional questionable decision. After switching to Mobil 1 0W-40, cold starts are smoother, oil pressure is rock solid, and the motor just feels happier. No weird noises, no drama, no oil consumption surprises. The viscosity is perfect for a performance Subaru build, especially if you’re running tighter tolerances or want strong protection under heat and load. It’s thick enough when hot, flows great when cold, and inspires confidence every time I turn the key. Is it technically “European”? Sure. Does my Subaru care? Not even a little. If you’re running a built engine, turbo setup, or just want a proven, high-quality oil that punches above its weight, this stuff earns its reputation. My bugeye may not be European, but it’s living its best life on this oil. Would absolutely buy again—passport not required.

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Reviewed in the United States on January 18, 2026