Please note this is a R2 release of our famous Air/Oil Separator System with improved hoses available in Black, Blue or Red colors (see catalog photos)! This AOS will not require modification of the engine cover.

It also fits the new IS500 per photos.

The RCF & GSF Air/Oil Separator is a by product of our F track development program. During on track testing and data logging, it became clear that the PCV (Positive Crankcase Ventilation) was allowing for significant ingestion of oil into the engine. Oil ingestion results in ignition retard due to the low octane of engine oil as it burns up. Additionally, oil burning in the engine results in carbon deposits on the intake valves, pistons, and combustion chamber which further increases the propensity for power-robbing detonation. You don't have to take your IS-F to the track to benefit from our Air/Oil Separator. Anyone who drives aggressively on twisty roads with hard acceleration and deceleration will benefit from avoiding oil ingestion into the engine.

The RR-Racing Air/Oil Separator is an fully sealed design featuring an advanced zero maintenance air oil separator with a level indicator for easy inspection. We utilize only the finest quality fittings and urethane hoses. All you have to do is check the level indicator and periodically empty the canister.

This is the second version of our AOS product. In this version the canister has almost three times the capacity, and we made a change in the bracket design for better fitment.

All components in this product are proudly engineered and manufactured here in the United States of America.

Please click on one of the links below for more relevant detailed information about our approach to engineering great products for your Lexus: