Dcasole

Agreed ! And very well put

Dave

Dcasole

Then you use the PF64 ... others are ok with either

Dave

kodpkd

Thank you. And you can put any filter you want in your car. BUT GM does not recommend the UPF64R filter for the LT1 or the Mobil 1, 113A,,,, in fact they say [size=13px]specifically,,,, not to use the high psi or too low psi bypass filters![/size]

kodpkd

I keep hearing about the C7 and the engine failure problems. Lifter failure, pushrod failure, ETC. Do we know 100% that this isn't related to using the wrong filter?

sjw91

One failure in 2014 was attributed to an oil filter, and it was the Car and Driver long term car. It was the original version of the PF64, part # 12640445. https://www.torquenews.com/106/car-d...me-more-common

But the PF64 is installed on millions of GM cars and trucks. If it were killing engines, we would have seen a lot more failures the last 10 years.

kodpkd

I wasn't thinking about the PF64. I am wondering about all the owners that don't use the PF64.

Red Mist Rulz

Not with the wrong bypass pressure it isn't.

Dcasole

I am sure the engineers said it was OK....

Dcasole

I think that's a stretch , you don't think the GM engineers don't analyze these failures ....

Dave

kodpkd

That's the point. The engineers did come out with a bulletin and said to ONLY use a filter with 22 PSI bypass pressure. Not 11 psi and not 34 psi.
Read the first paragraph in the info section. The engineers seem to think it can cause damage to bearings and other tight tolerance areas, and engine failure. Hummm!

KLG

I realize selecting an oil filter can be confusing.

Either the PF64 or the UPF64R is ok to use on the LT1 and LT4 engines. Many dealers use the UPF64R instead of the PF64. And the GM / AC Delco website lists either filter as acceptable for the LT1 and LT4.

Regarding the oil filter having the correct by-pass pressure, it is important, as the GM service bulletin states. The PF64 is around 22 psi and the UPF64R is around 35 psi. However, the problem is more with using a filter that has too low of a by-pass pressure (such as the PF48, the Mobile-1 113a), rather than too high of a by-pass pressure. Oil filters with the lower by-pass pressure may by-pass needlessly due to the oil pressures produced by the LT1/LT4 oiling systems.

For my vehicles, I use filters with 22 psi by-pass valve setting, (Wix WL10290xp, Wix 57502xp), but I would not hesitate to use the UPF64R if I had to do so.

Regardless, the PF64 is OEM, you can't go wrong using it.

kodpkd

Well, then you have to ask yourself why does it bypass at 22 psi? Not a big deal for the system to wait until 35 psi? Nothing to do with the variable pressure pump? Why does it have a bypass valve in the first place? Can it be 50 psi? Maybe the engineers know rather than someone trying to sell you a filter.
So you use the GM parts store website to determine what oil filter to use?

Oskee

Reading GM Service Bulletin 17-NA-157 Dated Sept.2023 (spin-on oil filter )
lists the LT1 and LT4 for the PF63 ( 22psi bypass ) But no mention of the LT5
Makes me wonder, did the GM engineer's forget ? or exception on the LT5
Owners manual and catalog states PF 63

kodpkd

The C7 LT1 and LT4 use the ACDelco PF64, not the PF63.

Oskee

Sorry My Bad ! catalog lists PF64 for the LT5

Dcasole

Do u really think there is a conspiracy going on ..... lol lol 😆

Dave

kodpkd

No. Just correct info vs BS.

The issue is caused by Chevrolet deciding to put a variable pressure pump on the Corvette. Good or bad, that's what's on the car.
At low RPM's the pressure is low, at high RPM's the pressure it high. Lets say you decide it is ok to use a 35 PSI filter, The oil pressure is at 30 PSI during low RPM, the filter media is restricting the flow, a 35 PSI bypass filter will starve your engine of oil, BOOM!
The reason GM says to only use a 22 psi bypass filter is because the output pressure of the pump wont be below 22 PSI.
Kind of an engineering thing.

AnotherNorskie

The bulletin does not say "only 22". It says 22 is acceptable, and 15 and lower is not.

My take is that the bulletin points out the PF63 isn't an acceptable substitute. Whether it says anything about the UPF64R is speculation based on what else the bulletin says vs. what we know about the UPF64R.

It says other filters must be "equivalent to PF64". The UPF64R has a higher bypass but it also has a lower backpressure filter media. It has a higher quality valve, so it might be more consistent in opening enough at the specified PSI (I doubt the valves are binary, i.e. they don't open 100% at 23 psi ... I suspect that open a certain % at certain psi - for example, at the PF64 may 'open' at 22 psi and then only flow X gal per second at 40 psi ... and the UPF64R's valve may start to open at 34 psi and at 40 psi reach the same GPS as the PF64. We can speculate that at a PSI somewhere between 22 and 34 the UPF64R will continue to filter oil at acceptable flow rates while the PF64 won't.

There are people smarter than me which have the information above, and they state that both the PF64 and UPF64R are acceptable for the LT1. The PF63 is not.

Dcasole

Finally a voice or reason .... Nice NORSKI !

kodpkd

So YOUR definition of equivalent is, 35 PSI is ok when GM says 22 PSI. OK. You can speculate.

Show me where the smarter people are recommending the UPF64R, [size=13px]besides a parts list.

Did you really read the bulletin? 17-NA-157?[/size]

Note: Any aftermarket filter must also have an internal bypass valve opening pressure specification, element integrity, filtration performance, media particle trap specification and burst strength that is equivalent to the ACDelco PF64/PF63E filters.

The LT1 and LT4 engines are not having any internal engine issues?