Exactly. I would never use a Fram filter on a car that sits several days or more between starts. Learned my lesson on my 72 vette garage queen.
I didn't know that.
oil filter difference
Thread Starter
Intermediate
Joined: Mar 2009
Posts: 25
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From: Maricopa Arizona
oil filter difference
I am a snow bird, so my cars sit for 5 to 6 months during the winter without being started. When I start them in the spring the lifters allways clattered.for a while. I was using Fram filters and every spring had this problem My son told me that Fram does not have a bleed down valve so it drains out. I switched to GM and have had no lifter noise whatsoever when they are started. He said the GM filter won't bleed out and holds the oil.
Retired & lovin' it!
Joined: Mar 2005
Posts: 4,474
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From: Jackson NJ
I've only used K&N filters in my C6.....bit more expensive but from the various reports I've read, they seem to have better filtering capability. Big "plus" too is the hex fitting on the end cap that makes removal very easy.
Race Director
Joined: Sep 2000
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From: Missouri City, TX
Race Director
Joined: May 2001
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From: Guelph, Ontario
The anti drainback valve is something completely different, that's never built into the block of an engine, but it's in the filter itself. This holds the oil inside the filter (for horizontal or upside down mounts) and it also holds the oil in the passages above the filter (for downward mounts like on the LSx series of engines) when the engine is shut down. This antidrainback valve helps the engine get lubrication a split second quicker, which is why when you've got a faulty one (like happens often with Fram's cheaper filters) you'll often hear valvetrain noise for a second or two on cold starts.
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Burning Brakes
Joined: Mar 2008
Posts: 815
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From: Mesa "highlands" AZ
What you're thinking of is the bypass valve, which is used under certain conditions (such as when the oil is very cold) to bypass the oil filter. On the 05 and 06 LS2 the bypass was built into the block, so the oil filters did not have them. Beginning in 07 the LS2 no longer had the bypass valve built into the oil filter base on the block, which is why a new oil filter was specified with the bypass built into it.
The anti drainback valve is something completely different, that's never built into the block of an engine, but it's in the filter itself. This holds the oil inside the filter (for horizontal or upside down mounts) and it also holds the oil in the passages above the filter (for downward mounts like on the LSx series of engines) when the engine is shut down. This antidrainback valve helps the engine get lubrication a split second quicker, which is why when you've got a faulty one (like happens often with Fram's cheaper filters) you'll often hear valvetrain noise for a second or two on cold starts.
The anti drainback valve is something completely different, that's never built into the block of an engine, but it's in the filter itself. This holds the oil inside the filter (for horizontal or upside down mounts) and it also holds the oil in the passages above the filter (for downward mounts like on the LSx series of engines) when the engine is shut down. This antidrainback valve helps the engine get lubrication a split second quicker, which is why when you've got a faulty one (like happens often with Fram's cheaper filters) you'll often hear valvetrain noise for a second or two on cold starts.
I agree with you.....up to a point !!
The last paragraph MAY be slightly incorrect. GM's Ecotec engines (I know they're only 4 cylinders) use a filter that is a cartridge insert. It essentially looks like a regular filter WITHOUT the case and is held together by a plastic frame that exposes the filtering media. As a result, unless the drain back principle is NOT used, the anti-drainback must be in the casting of the block/filter holder.
You know if I not mistaken, the V-6 Olds Aurora used the same cartridge type filter but was removed from the bottom (as opposed to the Ecotec's top mount).
I further understand GM may be utilizing this method on more models in the future.
