🏁 COF-21134 COF40 Costa Oil Racing Filter vs Fram PH4 – The Best Oil Filter for the 525ST Crate Engine
When you’re running a 525ST crate engine, every component matters — especially your oil filter. The 525ST is a beast on the track, but it demands high oil flow, strong filtration, and serious durability. That’s where the COF-21134 COF40 Costa Oil Racing Filter comes in.
While many racers have defaulted to the Fram PH4, it simply wasn’t designed for the punishment of high-RPM, high-temperature crate racing. The COF40, on the other hand, is purpose-built for racing — and it’s quickly becoming the filter of choice for serious 525ST competitors. 💪
🔧 Why the COF-21134 COF40 is the Best Oil Filter for the 525ST
The 525ST pushes serious horsepower, and that means your oil filter needs to keep up. The COF40 was designed from the ground up to handle crate racing conditions — not commuter traffic.
Race-Ready Advantages:
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✅ High-Flow Filtration – Keeps oil moving freely at high RPM
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✅ Built for Pressure – High burst strength and anti-collapse design
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✅ Optimized Media – Engineered to trap racing debris without restricting flow
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✅ Direct Fit – Perfectly fits 525ST crate engine applications
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✅ Backed by Racers – Proven on dirt and asphalt tracks nationwide
🔥 COF40 vs Fram PH4 – Side-by-Side Comparison
| Feature | COF-21134 COF40 (Costa Oil Racing) | Fram PH4 |
|---|---|---|
| Designed for Racing | ✅ Yes – Built for crate engines like the 525ST | ❌ No – General automotive use |
| Oil Flow Rate | 🔥 High – Supports high-RPM operation | ⚠️ Moderate – Can bottleneck at high speeds |
| Filtration Quality | 🏆 Premium – Filters fine racing debris | ❌ Standard media, not race-tuned |
| Bypass Valve Calibration | ⚙️ Race-optimized bypass pressure | ⚙️ Generic factory setting |
| Internal Build Strength | 💣 High burst rating for racing abuse | 🚫 Lower burst resistance |
| Fit for 525ST Engines | ✅ Yes – Designed for crate racing | ❌ Not recommended for race setups |
| Racer-Approved | 🏁 Used by top crate engine teams | ❌ Rarely used competitively |
| Country of Origin | 🇺🇸 Made in the USA | 🚫 Often imported or outsourced |
| Long-Term Engine Protection | 💯 Superior under race conditions | ⚠️ Moderate, not ideal for racing stress |
🛢️ Why the Fram PH4 Falls Short for Racing Applications
The Fram PH4 is a commonly found filter — but that doesn’t mean it’s built for crate engine racing. It was designed for light-duty automotive use, not for high-output crate engines like the 525ST. Under race conditions, it may restrict flow, struggle with pressure spikes, or allow contaminants to recirculate due to a generic bypass setting.
On the other hand, the COF-21134 COF40 was created by racers, for racers. It provides the protection your engine needs when you’re pushing it to the limit.
👊 Why Racers Are Switching to the COF40
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🧠 Designed specifically for crate racing engines like the 525ST
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🛠️ Built with premium materials for durability and performance
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🇺🇸 Made in the USA with strict quality control
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💪 Delivers race-winning oil pressure and flow every lap
From local tracks to national series, the COF40 is quickly becoming a must-have filter for crate racers who take performance seriously.
🏆 Final Verdict: COF-21134 COF40 > Fram PH4 for 525ST Engines
If you’re running a 525ST crate engine, the choice is clear: The COF-21134 COF40 Costa Oil Racing Filter is the superior option for performance, durability, and peace of mind. The Fram PH4 just can’t compete when it comes to flow, protection, and race-readiness.
Don’t compromise on your engine’s safety. Step up your game with the COF40.
🛒 Available now from Costa Oil Racing – Get the filter built for the win.
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