OK, finally got around to winter oil change today. Second OCI with Red Line, 1st was 5W-30. Sending in Blackstone UOA. Used PUP 0W-40 prior. Intent of change is to prevent valve lifter roller failure.
Also, this is 1st use of Royal Purple Oil Filter for me on any engine. Regardless of the current hubub about Fram Ultra XG changing media, I'd always planned to change to Royal Purple #20-500 to obtain more media surface area (less oil flow resistance - not much concerned with greater contaminate trapping area). I wrote a long, rambling post of comparison earlier.
As some others have note, Royal Purple Oil Filters have a much higher EVIC Oil Pressure reading. We were debating why, and what it might mean, but kind of went around in circles on that. My EVIC Oil Pressure using Fram Ultra XG (original media) was 35 psi idle, 55 psi running, regardless of temperature or load.
EVIC now reads 55 psi @ idle - it's never done so before. Since the oil circuit is supposed constant volume, variable pressure, maybe it means oil is flowing freer downstream of the filter? Anyway, others report the same phenomenon.
I've been googling articles. I did a complete set of antifreeze flow calculations for a US Navy Missile Launcher for anti-icing long ago, and it seemed simple then. For a constant flow variable pressure system, that is. I think I'm seeing that a higher downstream pressure using the same viscosity oil at the same temperature means that the pressure has moved downstream from the filter media to the machine. While the total SYSTEM flow rate would be the same at the end of the flow circuit, the flow rate would be higher up to the most restrictive point of the system, since it is no longer the oil filter.
Blah, blah blah........that means flow rate is higher throughout much of the engine. Which is good.
For users of NAPA PLATINUM oil filters for the 5.7. I found two today, 47060, they cannot be located at any NAPA warehouse in the US according to the NAPA stores. Also unavailable at any of the stores. Just saying, if true , don’t know what the story is. If anyone knows, post it.
I had to make an unexpected run across the metro today - a good time to check the EVIC Oil Pressure readings with the new Royal Purple 20-500 Oil Filter.
Ambient Temperature today was around 40 degrees F, warm for here this time of year. Starting up, EVIC Oil Pressure read 60 psi again @ high idle....never read this high using Fram Ultra XG. As stated above, not sure what this means.
With engine fully warmed up on the highway (app. 40 mile trip each way), EVIC Oil Pressure read 53 psi. This is definitely lower than with Fram Ultra XG, where it never varied from 55 psi.
At stoplight idle, EVIC Oil Pressure read 33 psi. This is also definitely lower than with Fram Ultra XG Oil Filter, where it never varied from 35 psi.
Before you say - wait! You changed oil vis from 5W-30 to 0W-30! I don't think that matters - oil pressure never varied using Fram Utra XG Oil Filter, regardless brand or viscosity of oil I used. Both PUP 0W-40 and Red Line 5W-30 produced the exact same EVIC Oil Pressure readings with the Fram Filter.
Ok - let the edumacated speculating commence...........