I lifted info about E-cores from a GM truck forum a few years ago.
The PF48E primary performance improvement relates to the relief valve design. The PF48E has a compression spring loaded nylon poppet that outperforms the current valve design.
Other benefits: •Element integrity (collapse strength) is increased by 25%. This is because the nylon cores are perfectly round. •Filter media, which is unchanged, is no longer potted in adhesive which blocks filtration area at each end. •Filtration performance (efficiency and capacity) are both unchanged. •The filter shell configuration is unchanged. Existing cap wrenches continue to fit. •Hydrostatic burst and impulse fatigue performance are both unchanged. •Relief valve performance is much improved and statistically more stable. •Hot oil durability is improved by elimination of adhesive. •Cold weather performance (-30 C) with dexos 1 oil is excellent. •Improved level of robustness to water accumulation. •Nitrile material used in the sealing gasket and the anti-drainback valve is unchanged. •PF48E filters meet performance specifications as defined by GM Powertrain. •PF48E filters will be used in OE production in the near future.
The photo below shows the improvement to the cage.
ACDelco PF1250-15125ES-Old vs New style cage Side by side old cage on the left with new cage on the right. The new cage has 8 verticle supports and 7 rings to support the media. This design change reduces the window size and the vertical supports can also lend support to the media. A design with reduced risk of media blowout. I prefer this design over the old one.
2004 Ford Ranger 4.0L V6 Valvoline Advanced Full Synthetic 5W30 + Fram Tough Guard