On doing oil filter research for the wife's new Grand Cherokee, I ran across this on the National Oil & Lube News (fast lube and quick maintenance industry’s oldest and largest trade publication [their description]) web site. Even considering the source, it may be worth remembering as a precaution.
Chrysler’s 3.6L Pentastar Engine
A high failure rate of broken bypass valves continues to be reported on the Chrysler 3.6L Pentastar engine. Vehicles have been serviced and customers allowed to leave with broken bypass valves and missing springs. Lube service technicians have seen the loose components and heard the springs when they dislodged during a filter change but failed to identify the damaged components as a part of the bypass valve. The bypass valve on the 3.6L Pentastar engine may be positioned in one of two locations:
1. 2011–2013 vehicles will incorporate a bypass valve mounted in the oil filter housing. If the valve is damaged, the complete oil filter housing must be replaced.
2. 2014–2016 vehicles will contain a bypass valve mounted in the oil filter cap. When removing the oil filter from the cap, pull the filter straight from the cap. Do not rock the filter back and forth to release it from the cap, as damage to the bypass valve can occur, requiring a cap replacement.
It is imperative the vehicle does not leave the service facility with a damaged or non-functional bypass valve, as engine damage can result.
Extended Service Intervals
Vehicle manufacturers are promoting extended service intervals, as it helps sell vehicles. With today’s powertrain technology, synthetic lubricants can last 12,000-15,000 miles. Conventional oil filters are not designed to provide protection for that length of service. Vehicles driven for those service intervals should be equipped with an extended life oil filter. Operating a vehicle under an extended service interval with a conventional oil filter is playing Russian roulette with the engine. A lot of attention is given to the lubricant with little consideration as to how long the filter will last without bypassing.