Late model Hemi engines offer many advances in technology, and we think this power plant is likely the best performance engine ever designed by the Chrysler Corporation. With a great blend of power, smooth, quiet operation, and economy, the 5.7, 6.1, and 6.4 Hemi engines hold their own against any performance V-8, modern or classic. And while modern Hemi engines offer great improvements over older Chrysler V-8 engines, some parts of the new Hemi, like the PCV system, are very similar to older engines.

PCV stands for positive crankcase ventilation, and the PCV system vents the crankcase into the induction system to help lower emissions and provide a constant vacuum on the crankcase, aiding piston ring seal. There is a downside to this method of crankcase ventilation, however, and that drawback is that small amounts of oil and oil vapor can be sucked into the induction system, and then into the engine’s combustion chambers. This problem is made worse in engines with higher crankcase pressures, like those that are turbocharged or supercharged.

Installing the JLT Performance Ultimate Oil Separator is easy, and we accomplished the task in about five minutes with a Philips screw driver, ratchet, and 13mm socket. The oil separator is ducted into the PCV system using the provided half-inch hose on SRT-8 models, but we had to install additional hose to properly route the oil separator to our 5.7 Hemi’s PCV system due to an aftermarket cold-air intake being installed. This modification won’t yield any dramatic power gains, but it will prevent oil consumption, adding longevity to our car’s engine. The two-ounce reservoir on the separator needs only to be drained at each oil change interval, and is knurled for easy removal. For the price, performance, and the ease of installation, we feel this is a great upgrade for your late-model Hemi powered Mopar.

Oil and oil vapor in the induction system is bad for a couple of reasons, the first of which, is that oil vapor dilutes the gasoline, reducing the effective Octane rating of the fuel. Lower Octane means a higher likelihood of detonation, which reduces performance and can cause engine damage. The other drawback of oil entering the induction system is that the oil and oil vapors coat the blower or turbo rotor blades, and coat the fins of the intercooler, reducing the overall efficiency of supercharged or turbocharged engines.

A solution to this problem is to separate the oil from the PCV air, which can be accomplished by an air/oil separator. We decided to install one of these products on the 5.7 Hemi in our 2006 Dodge Charger, and our research led us to JLT Performance. JLT Performance is known for their quality cold air intake kits, and offers several late-model performance products. Their Ultimate Oil Separator is designed for the SRT-8 Hemi engines, but is also easily adaptable to the 5.7 Hemi. Constructed from billet aluminum, the JLT oil separator has a metal mesh pre-filter element, a knurled aluminum base for easy removal, and is available in either a black or silver anodized finish.

Costs for JLT Performance Ultimate Oil Separator Kit: $119.00