But the flow in an engine is determined by the PD oil pump output volume as a function of engine RPM. So the same flow volume in a larger gallery means less oil pressure.
GM Duramax 2020-2021 oil filter vs. 2001-2019 oil filter
- Thread starter wwillson
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If it was 10 GPM at 1600 RPM then it would be at 20 GPM at 3200 RPM assuming 100% pump efficiency. I highly doubt it puts out 20 GPM at 3200 RPM.
If you want a filter that flows well, you need to go with a full synthetic media.
Amazing it’s the same size as the PH2/FL820S filters used on modular gas Ford engines-wonder if the OG Ultra XG2 would be a good choice?
I've also been looking at this Baldwin filter for my 2021 GMC 3500 HD. The choices seem to be fairly limited currently for alternative filters. When I last checked a couple months ago, Fram was not making an Ultra for this engine.
The Fram product lookup doesn't list the XG2, but if you look at the scrolling window of the vehicles that use the XG2, the Duramax is indirectly listed as the 4500, 5500, and 6500 HDs. The threads are correct 22mmx1.5mm. I have one waiting to go onto my Duramax the next filter change.
https://www.fram.com/parts-search/XG2/
You are correct! I reread this and it made me look at the cut filter - sure enough it was an Ultra!
Good news is there seems to be a fair amount of wire backed XG2s available, since they’re less popular/older than a lot of filters (XG7317, 10060, 10575, etc.) and other than a thin can & occasional weak leaf springs, are a solid, good flowing full synthetic design. Hard to believe GM is putting a cellulose filter that small on a Duramax!
An update on why the 2020+ Duramax engine oil filters are smaller. The 2020+ Duramax has a higher capacity oil cooler which is physically larger in size. The space the oil filter occupies between the cooler and the frame is smaller, hence the reason for the smaller filter. The bottom line is this was a trade off. I think it's rational to surmise the 2002-2019 Duramax filter was properly sized by the engineers who designed the engine. The engineers likely wish the 2020+ Duramax could use the same filter as the 2002-2019, but there isn't as much physical room, so a compromise was made. You want a larger cooler, then you get a smaller filter.
Tough decision there…. Better oil temperatures or longer OCIs. I guess the one benefit of the decision is you can change your oil, trying to cool oil off while using your truck is way harder.
Just my $0.02
dnewton3
Staff member
Good info, Wayne.
Can you post some comparitive pics when installed?
I finally got around to installing the PPE fuel cooler pump relocation kit and installed the much larger PPE filter.
https://bobistheoilguy.com/forums/t...ump-relocation-kit-and-ppe-oil-filter.387250/
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Came across this post after trying to find flow rates for the 2020-2024 L5P duramax oil filters. I have a 2020+ L5P oil cooler on my 2007 LBZ duramax race truck after I built the motor 3 years ago. My last three races, the truck began to slow and I can’t find anything wrong with the truck. The only thing I changed was putting on PPE high efficiency filter, which makes me think it probably wasn’t flowing as well as the PF 26 oil filter I had been using. Now, I don’t know a restrictive oil filter would cause my slowing track times. Usually my truck is very consistent, I’m just trying to figure it out. I did come across someone that stated a high efficiency oil filter will need to be compromised for a higher flow. I’m trying to find a balance between filtering and flow, have been tearing up the internet trying to find the best oil filter with the best balance. My last race was 10 days ago, have changed my oil since that time with an oil analysis and putting back on a PF 26 oil filter (have used since built motor). If anyone can shead some light on the subject, would greatly appreciate it.
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The PPE filter has 100% more filter media than the PF-26 and the PPE certainly flows more. Both have a by-pass valve that opens at similar deltaP. Either filter is not your problem.
Yes, either filter will encounter their flow limit and the by-pass valve will open. Again, the filter is not why your truck is low on power.
It would be interesting to interview an engineer or whomever changed the parameters and why.
This is why they put a smaller oil filter on the 2020+ L5P:
Do you have an accurate oil pressure gauge in the truck? What's the oil temperature when you run down the track? What oil viscosity are you running? You have some crazy high volume oil pump on the engine?
As @wwillson mentioned, it's probably not the oil filter. Oil filter flow restriction is typically only around 1/15th the total restriction of the oiling system, and with hot oil at 200F the dP across the filter is around 5-7 PSI of dP at pretty high RPM. Swap out the oil filter for some other brand while at the track and see what happens. The Purolator Boss flows well, but isn't very efficient. And you can actually get both high efficiency and good flow (meaning low filter dP vs flow) depending on what filter it is. High efficiency doesn't always mean more flow restrictive.
Once you install the PPE relocation kit, can you use the standard 2001-2019 filter on 2020+ L5Ps without issue?
No absolutely not, the threads are different.
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