The bypass is there in case the filter gets plugged if I understand correctly, what would cause the filter to become plugged If oil changes are done on a regular basis ? I have a 2012 GMC with a 5.3 which calls for a filter with a bypass number of 15 lbs. I would like to go to a longer/bigger filter, PF63 which has a bypass number of 22, as long as I have good oil pressure is there any harm? As I have begun to research this I had no idea there were so many variations in oil filters. Thank you for your comments, Tom.
Oil filter bypass questions
- Thread starter xcrtom
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well for sure when the oil is cold its thicker and doesnt go through the media very well so the bypass allows proper oil flow. This is a bypass not to be confused with bypass oil filtration which is finely filtering a small amount of oil at all times through a separate filter than your regular oil filter.
Basically if the pressure differential across the filter media is higher than the rated bypass, then it goes through the bypass. If routine changes (i.e. the filer media is not getting full from combustion byproducts, dirt, grime, etc.) are performed, then it should in theory not be a case during operating temperatures. It could potentially be the case when the oil is cold.
The PF63 was originally around the same bypass as a PF48 (short M22 x 1.5mm) but was updated to the higher bypass for Gen V engines. The Gen V oiling system does have a variable stage oil pump (prob not explaining this right) where it'll command lower/higher pressure. Different from Gen IV LSx.
I don't know about this one. I might be inclined to just stay with a PF48/or aftermarket equivalent. Curious also what others think.
The PF63 was originally around the same bypass as a PF48 (short M22 x 1.5mm) but was updated to the higher bypass for Gen V engines. The Gen V oiling system does have a variable stage oil pump (prob not explaining this right) where it'll command lower/higher pressure. Different from Gen IV LSx.
I don't know about this one. I might be inclined to just stay with a PF48/or aftermarket equivalent. Curious also what others think.
When used in a typical engine that does not have a gross amount of sludge and dirt, the media in a standard canister filter wont load up to the point the filter is in bypass all the time. The bypass is mainly there, as E150GT mentioned, to prevent oil starvation in cases like when a cold engine (with thick oil) is rev'ed up and the thick oil can't pass through the media fast enough and causes a pressure differential greater than the bypass rating between the oil pump side of the filter and the outlet side of the filter.
All that to say, you can safely use the larger filter, but unless you're greatly extending the oil change interval or have a really dirty engine or live in a cold climate AND like to put the hammer down on a cold engine, it won't really matter IMO. Instead, if I wanted to improve the oil filtering in my engine, I would look at filtration efficiency more than filter size.
All that to say, you can safely use the larger filter, but unless you're greatly extending the oil change interval or have a really dirty engine or live in a cold climate AND like to put the hammer down on a cold engine, it won't really matter IMO. Instead, if I wanted to improve the oil filtering in my engine, I would look at filtration efficiency more than filter size.
Perhaps you may be interested in a MicroGard Select. Some great looking PG-made filters. MSL57045 is the part number.
Here's a sale on eBay for a case. I've bought these before, by the case, they're usually in-transit or lost shipments that then get sent to auctions.
https://www.ebay.com/itm/305381876867
Here's a sale on eBay for a case. I've bought these before, by the case, they're usually in-transit or lost shipments that then get sent to auctions.
https://www.ebay.com/itm/305381876867
BrendanC
$100 site donor 2024
i spin on only the 10575 sized filters on 07+ gm products. no issues over hundreds of thousands of miles.
Not really because when the oil is cold and thicker, less oil is needed to be fed everywhere in the engine. The amount of oil that leaks out of bearings is dependant on the viscosity.
I would say it's more likely to happen at very high rpm in a hot engine, so racing conditions. Also because there's more slip in the oil pump when the oil viscosity is at it's lowest.
Well a good search reveals the cause for oil to bypass the media for 3 main reasons.
Clogged filter.
Cold oil- thicker oil can't flow through media.
High oil pressure- during high speed or heavy load driving the oil pressure can increase causing bypass to open
I would think if the full flow filter isnt clogged and your oil pressure at idle is higher than the pressure rating of the bypass valve you are okay.
The oil pressure seen in the oil gallery where the pressure sensor is located has nothing to do with the dP across the oil filter bypass valve.
The filter bypass valve only operates on the dP across it. You could have 100 PSI of oil pressure and only 10 PSI of dP across the filter bypass valve.
I use toilet paper filters. I noticed after a trip to Dallas Texas I got a little more abrasives on the top of the toilet paper. Probably when I floored it to enter the freeway a few times the bypass valve opened in the full flow filter.
Didn't you kept saying in the other thread that none of your full flow filters ever show any captured debris.
Yes, cold oil. The bypass valve is necessary to prevent the filter media from collapsing. Not everyone knows the oil flows in from the outside and out the center.
Because of the difference in bypass settings I’d just use the correct filter. There’s probably nothing much to gain by using a longer filter anyway. Oil filters shouldn’t get loaded past capacity or even close under normal circumstances if you change the oil at reasonable intervals.
I tolerate some in the bypass filter. Right now I have more because I removed the full flow filter. Like the good old days before we had full flow filters. The little shiny particles are like stars on a dark night. I have only driven about 12 miles without the full flow filter. What the toilet paper will look like in 50 miles I will find out next week.
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That’s seems like a mystery, losing shipments, or in transit, then sending them to auction.