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Having a 2015 I got 4 free oil changes and each time the dealer used PF64. Guess I will continue using the PF64 and if the filter ever fails ,I will be covered. I had a friend whose C-6, 427 blew up and GM checked out his engine for several days trying to blame it on him. Finally they gave up and ordered him a new 26K 427.
Reading the bulletin that Jerry posted, it would seem the PF54 has a HIGHER pressure bypass spring, not lower one.
Before using a different filter, even the 64R, I'd still want to know what the bypass pressure specification is. GM doesn't reference the 64R in their bulletin. Because they don't think people will know about it and use it, or because it doesn't meet the spec? I don't know.
Reading the bulletin that Jerry posted, it would seem the PF54 has a HIGHER pressure bypass spring, not lower one.
Before using a different filter, even the 64R, I'd still want to know what the bypass pressure specification is. GM doesn't reference the 64R in their bulletin. Because they don't think people will know about it and use it, or because it doesn't meet the spec? I don't know.
For those interested this is what is in the C7, both LT1 and LT4. It's called a variable volume oil pump. The computer defines when high volume is not needed like at idle or when cruising at under ~1500 rpm and not demanding power, assume when manifold vacuum is high. It moves the multivane pump outer casing to reduce the volume of oil pumped saving energy. We see that as lower pressure.
Have no fear the rod and crack bearings just need oil volume they generate their own pressure when rotating, at times over 3000 psi!
Variable Volume Oil Pump in C7.
Bullshit. Let the oil pressure drop to 10 psi at 6,000 rpm and see what happens.
Bullshit. Let the oil pressure drop to 10 psi at 6,000 rpm and see what happens.
I didn't say you could operate at 10 psi!
The Variable Volume Pump in your C7 would increase the volume when your engine vacuum was low and at higher rpm as it it would be with your foot to the floor. That will raise the pressure. It's smart!
There are pressure drops in the system but if there is sufficient oil volume the hydrodynamic wedge formed in a crack and rod bearings it will generate an oil film well past 3000 psi at 6000 rpm. You didn't think 45 psi kept the crack separated from the bearings at 460 hp!
The way I read that Bulletin it appears that if a vehicle can use the 64 it can also use the 64R no?
That bulletin came from another poster in another thread. He found it. He was trying to define the relieve valve pressure from a tech at I believe Mobil. Couldn't get a number.
IMO you need to have AC Delco validate if it is or isn't. That filter has been around for a while and used on racing engines that operate at high oil pressures (or used to.) It would not have to have a low relieve valve pressure. Assume they would say it meets or doesn't.
The Variable Volume Pump in your C7 would increase the volume when your engine vacuum was low and at higher rpm as it it would be with your foot to the floor. That will raise the pressure. It's smart!
There are pressure drops in the system but if there is sufficient oil volume the hydrodynamic wedge formed in a crack and rod bearings it will generate an oil film well past 3000 psi at 6000 rpm. You didn't think 45 psi kept the crack separated from the bearings at 460 hp!
I know that when the pressure drops to 10 psi you need to look for a place to park!
I think all dry sumps come from the factory with the UPF-64R.
^^^
Yep there are pressure drops in the system so you do need enough pressure to supply oil to the main and rod bearings. But as I said the C7 is smart it controls the volume by altering the pump configuration depending on rpm and load!
I recently replaced the filter in my Grand Sport at it's 500 mile change. It was a PF64 as was the filter in my C7 Z51 (both dry sumps.)
They are made by Champion Labs, as is the PF64. The M1-113 is made to Mobil1 specifications and the PF64 to GM specifications. There are slight differences and the bypass valve pressure testing done to Mobil1 and GM specifications respectively. The M1-113 bypass valve tests at 17PSI which is above the 15PSI minimum stated in the GM Service Bulletin.
They are made by Champion Labs, as is the PF64. The M1-113 is made to Mobil1 specifications and the PF64 to GM specifications. There are slight differences and the bypass valve pressure testing done to Mobil1 and GM specifications respectively. The M1-113 bypass valve tests at 17PSI which is above the 15PSI minimum stated in the GM Service Bulletin.
Good info.
Think some folks who use and "defend" other than GM specified oil filters missed the key point! With the variable volume oil pressure pump introduced in the C7 GM says the specified oil filter bypass pressure value changed. Wheather "replacement" filters from other sellers (agree folks like Mobil are not in the filter business and manufactures like Wicks etc make for many retail brands) have the same new value was the question I raised.
Realize some have used other brands that "tests" show were better (often tests defined by someone trying to prove they are better.) However one of the car magazines had a engine failure during their C7 test. GM said it was because of a DEFECTIVE OEM DELCO OIL FILTER!
MY premise for my use of only the specified GM filter is if it fails and causes engine damage the repair would be covered. The odds of it happening are small with any filter BUT they are not zero!
You'all do as you wish, just stated my reason for doing what I do, especially since I change all my own oil!
Another thing is that I haven't seen an E-Core version of the PF64 on the shelves yet. It's the older tried and true ACDelco design.
Actually the E Core is a relatively new design and it's not something you want, the way the PF64 is made right now is better. One big thing about the E Core design that isn't as good is that it uses cardboard end caps.
Google "E-core oil filter" and read the horror stories and see the many pictures of these types of filters failing...
The Mobil1 M1-113 has been superseded by the M1-113a. I don't know the difference, but I suspect it might have a little higher bypass valve cracking pressure. Just comparing the two visually, I don't see any difference in their construction, so that's why I think the difference is in the bypass valve.
The M1-113a is at Walmart for $9.97 and with the current Mobil rebate, they are giving $12 rebate on a 5 quart jug of Mobil1 oil($22.88 at Walmart) and $5 rebate for a Mobil1 oil filter.
I just mailed off my rebate form for two 5 quart jugs of 0w40 European Formula oil and two oil M1-113a filters and will receive a check from Mobil in about 6 weeks for $34.
I was wondering why GM started using PF64 filter on everything from the 4 cylinders to the Corvette V8... Guess they are trying to use variable oil pumps on all the engines.
Actually the E Core is a relatively new design and it's not something you want...
Oh yes, I totally meant this is a good thing that it isn't an E-Core. The usual issue with the E-Core is the plastic center has too large of gaps and the filter media tears.
I was wondering why GM started using PF64 filter on everything from the 4 cylinders to the Corvette V8... Guess they are trying to use variable oil pumps on all the engines.
That is the case. Variable pressure pumps have lower power consumption at low output levels, so it increases fuel mileage a smidge.
07-08-2017, 07:30 PM
Good info.
