Critical Oil Qualities For Modern Performance Engines


The below is an editorial excerpt from a recent article on StangTV spotlighting Moroso Air/Oil Separators. While these products work great and are a “must have” for serious performance applications, a properly engineered high performance motor oil is also critical to solving these problems. Driven Racing Oils are formulated to have extremely low volatility and rapid air release properties. A low volatility prevents oil vapor from being sucked through the PCV system into the intake stream. Eliminating this problem reduces oil consumption and prevents oil blow-by from negatively affecting airflow or O2 sensor/catalytic converter performance. Rapid air release allows Driven Oils to quickly purge tiny air bubbles that can cause issues such as shorter lubricant life, increased fluid compressibility, lower fluid viscosity and cavitation.

Both qualities are especially important in modern late model performance engines (such as the Ford ModularGM LS platforms) and it just further proves that Driven Racing Oil sweats every detail to produce the absolute finest lubricants that you can put in your vehicle.  

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With Forced induction engines there is greater potential for blow-by, a condition where combustion gasses, or pressure get past the rings, this further increases crankcase pressure.

These increases in pressure put greater strain on an engine’s PCV system, and can send a mist of vaporized oil into the pcv hoses. This oil then collects on the inside of intake manifold, induction tubing, and intercooler.

That coating of oil then reduces the thermal efficiency of these components, affecting heat dissipation. Oil is also drawn back into the intake and subsequently the combustion chamber. Since oil has a higher ignition temperature than gasoline the octane level of the incoming air and fuel charge is altered, which can cause detonation. This incoming oil mist can also coat the backs of intake valves and the inside of the intake manifold, giving deposits something to stick to, eventually further hindering engine performance.

The solution is to trap the oil and separate it from the other gasses in the PCV system. The way to do that is with an Air/Oil Separator. “In higher horsepower or forced induction cars  the higher crankcase pressures can force more oil out through the PCV system. Trapping this oil before it coats the intake and the intercooler  is the job for a properly designed air/oil separator,” says Thor Schroeder of Moroso.

The Air/Oil separator works by using a specially designed billet filter media to trap the oil present in crankcase gasses as they pass through the PCV system. The gasses are allowed to circulate back into the system to be burned as part of the combustion process, and the oil is trapped in the separator, which can be drained and the oil either returned to the engine or disposed of properly.

Moroso offers many of these systems for specific applications, and in our case it’s part number 85485. The Air/Oil separator simply plumbs into the factory PCV system. We mounted ours to the driver-side strut tower on Wild E Coyote. This is a good location for both the length of the hose, and allows us easy access to the drain on the separator so we can recycle the captured oil every few weeks, since our car is also a daily driver.

For less than $air seperator 2150 the Moroso Air/Oil separator is one more safety net that can be installed for a reasonable price. At under $50 each the brake reservoir cover and underhood fuse panel cover also offer a little touch of style to our engine compartment appearance as well. We’ll be curious to see how much oil the separator catches once we start driving Wild E Coyote daily again, until then it’s nice to know excess oil wont’ be giving us any headaches.

The article above was created by Power Automedia.  The entire article can be viewed at


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