info from a source... but i am still looking for 'how' the variable cam timing devices work.. via oil pressure or what...
Oil system and engine lubrication
The advanced oil filter system eliminates oil spills, thanks to an incinerable filter element instead of the typical spin-on filters; the filter is conveniently located on top
of the engine.
A chain-driven, vane-type variable displacement oil pump adjusts the flow rate and pressure as commanded by the engine management system, which uses a solenoid to drive the pump into low or high pressure mode. For example, below 3,500 rpm, the pump conserves energy by using low pressure; at speeds over 3,500 rpm, the pump switches to high pressure.
A force balance mechanism inside the oil pump adjusts the size of the pumping chambers to alter oil flow. If the oil is cold, the pump reduces the size of the internal chambers. When the oil is hot and thinner, more oil is needed, and a spring increases the size of the pump chambers. This also saves energy.
The pump is driven at a 1:1 drive ratio; its location under the block is more efficient than an on-crankshaft location. An internal, mechanical ball-and-spring relief valve dumps oil into the sump when needed, for conditions such as a cold start with high engine speed. Both pump and pressure regulation solenoid are non-serviceable.
The engine takes six quarts of oil with a filter change. Traditional, non-synthetic motor oil with an ILSAC standard of GF5 is recommended. The standard change interval, with this oil, is 8,000 miles under normal driving conditions.
The oil pick-up tube is supported at the windage tray. Three oil gallery plugs are in the engine block; oil pressure an be monitored with a scan tool. Oil pressure and temperature sensors are on the oil filter housing assembly, which is mounted on top, between the heads; the oil cooler (a plate-style coolant to oil heat exchanger) is mounted to the oil filter housing as well. With Wrangler, specific upper and lower oil pan requirements have been engineered into the engine to provide increased grade requirements, keeping the oil within reach of the pump when the vehicle operates at steep angles (Wrangler also has a higher-mounted alternator to allow for water crossing, and a unique intake system with induction handled by a revised throttle body on the left side, where other Pentastars keep the intake on the right).