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Old 08-22-2015, 12:35 PM   #15
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Oil filter capacities for GM 8.1 eng.

One thing about the AC Delco filters PF454 & PF1218 have anti-drain back features as does most well known brands that are equivalent to. None of the 2 quart filter have that feature to the best of my knowledge no matter what brand. If that is not important to you, use what you are comfortable with. If your under a warranty you might what to stick with the PF454 or PF1218 or equivalent because it could be an issue.
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Old 08-22-2015, 04:07 PM   #16
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Anti-drainback valve only matters if the oil filter is mounted sideways or upside down. The 8.1 is mounted straight up, so it does not matter.
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Old 08-22-2015, 06:28 PM   #17
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Anti-drainback valve only matters if the oil filter is mounted sideways or upside down. The 8.1 is mounted straight up, so it does not matter.

That's what I was thinking too. No way for the oil to drain out of it.

That two quart filter looks pretty big. Do you extend your oil change out a bit due to there being more oil?
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Old 08-22-2015, 08:21 PM   #18
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Well some folks think the anti drain oil filters are of no real value. Some do not understand the reason to use them on an vertical mounted engine. Well anyone who wants to know can do the research and see the reason GM engineers decided to do this. First of all the main reason obviously had nothing to do with oil draining out of the filter, it prevents oil from draining completely out of the oil vanes from the ones that feeds all the bearings and the hydraulic lifters. This keeps oil above the filter to help from having a dry start. Without this filter type you have what is known as a dry start. I hope I've made this clear. And how do I know this you say? I retired 8 years ago from GM and worked in skilled trades as a toolmaker for 30 years and worked closely with drive train engineers back in the early 1990's. I got to know some of them really well. So there you have.
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Old 08-22-2015, 08:38 PM   #19
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Well some folks think the anti drain oil filters are of no real value. Some do not understand the reason to use them on an vertical mounted engine. Well anyone who wants to know can do the research and see the reason GM engineers decided to do this. First of all the main reason obviously had nothing to do with oil draining out of the filter, it prevents oil from draining completely out of the oil vanes from the ones that feeds all the bearings and the hydraulic lifters. This keeps oil above the filter to help from having a dry start. Without this filter type you have what is known as a dry start. I hope I've made this clear. And how do I know this you say? I retired 8 years ago from GM and worked in skilled trades as a toolmaker for 30 years and worked closely with drive train engineers back in the early 1990's. I got to know some of them really well. So there you have.
I respect that you are a retired GM worker and had the opportunity to work with all of those drive train engineers.

But you are flat out wrong on this, the ONLY reason for an anti drain valve is for those filters that are NOT mounted vertically, thus preventing the oil filter draining out.


Just a couple of links explaining what the Anti Drain Valve does


http://www.theautochannel.com/e_about/filters.html
http://www.wixfilters.com/Resources/...spx?NewsID=413
https://en.wikipedia.org/wiki/Oil_filter " Filters mounted such that oil tends to drain from them usually incorporate an anti-drainback valve to hold oil in the filter after the engine (or other lubrication system) is shut down. This is done to avoid a delay in oil pressure buildup once the system is restarted; without an anti-drainback valve, pressurized oil would have to fill the filter before travelling onward to the engine's working parts. This situation can cause premature wear of moving parts due to initial lack of oil."


Even with an anti drain valve you can hear the oil draining down into the oil pan, it happens everyday you turn your engine off
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Old 08-23-2015, 07:27 AM   #20
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What I've already said pertains to vertical mounted filters "ONLY". I sorry it wasn't clear.
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Old 08-24-2015, 09:50 AM   #21
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Anti-drainback valve only matters if the oil filter is mounted sideways or upside down. The 8.1 is mounted straight up, so it does not matter.
Correct, all filters should be mounted like that.
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Old 08-24-2015, 09:51 AM   #22
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Any clearance concerns with the longer filter? I know the motor is high, but I also would be concerned with it being the first thing to hit if you go over something.
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Old 08-24-2015, 09:52 AM   #23
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That's what I was thinking too. No way for the oil to drain out of it.

That two quart filter looks pretty big. Do you extend your oil change out a bit due to there being more oil?
No I don't, change it the same as always.
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Old 08-24-2015, 09:56 AM   #24
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Any clearance concerns with the longer filter? I know the motor is high, but I also would be concerned with it being the first thing to hit if you go over something.
It's not the lowest point under there.
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Old 08-24-2015, 10:00 AM   #25
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What I've already said pertains to vertical mounted filters "ONLY". I sorry it wasn't clear.
"Vertical" as upside down yes, on the 8.1 not needed. If the filter is mounted like the 8.1 it is full of oil so valve is not needed. Full is full so the oil can not go anywhere.
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Old 08-24-2015, 07:25 PM   #26
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Pete & Linda

Well everyone seems to agree that anti drain back filters are not needed on the 8.1 GM. NEW FLASH, THE BIG BLOCK GM ENGINES HAVE HAD THEM SINCE THE MID TO LATE 1990's. GM engineers decided this engine did need the anti drain back valve due to this engine having a soft knock on start up, this took care of that.
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Old 08-25-2015, 05:42 AM   #27
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Any clearance concerns with the longer filter? I know the motor is high, but I also would be concerned with it being the first thing to hit if you go over something.
my leveling jacks are a good foot lower. I never leave paved roads but if you do... make sure you have a good roadside recovery.
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Old 08-25-2015, 07:30 AM   #28
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Well everyone seems to agree that anti drain back filters are not needed on the 8.1 GM. NEW FLASH, THE BIG BLOCK GM ENGINES HAVE HAD THEM SINCE THE MID TO LATE 1990's. GM engineers decided this engine did need the anti drain back valve due to this engine having a soft knock on start up, this took care of that.
Can you explain what is meant by that term?
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