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#4527734 - 09/27/17 04:56 PM Flow Rate and Oil Cooler?????
redneck47441 Offline

Registered: 03/31/15
Posts: 27
Loc: Indiana
I read an interesting thought on another forum about filters that increase the flow rate possibly effecting oil temp. The thought was the oil flowing faster through a better filter causing oil temp to increase on vehicles with an oil cooler due to not enough dwell time in the oil cooler? Any thoughts on this would be appreciated, it kind of makes sense to me.

#4527784 - 09/27/17 06:00 PM Re: Flow Rate and Oil Cooler????? [Re: redneck47441]
901Memphis Offline

Registered: 08/14/10
Posts: 12893
Loc: Northern Kentucky
No, the oil filter is but a tiny restriction on the entire oil system.
2012 Chevy Cruze LT 1.4T - 50k
2002 Buick Century 130k - Built 4T65e(Maxlife) - Edge 0w40 + Fram XG3980

#4527789 - 09/27/17 06:03 PM Re: Flow Rate and Oil Cooler????? [Re: redneck47441]
redbone3 Offline

Registered: 06/09/12
Posts: 654
Loc: Reno, NV
I don't think it makes a lot of difference. If the flow rate increases it will result in a larger quantity of oil being cooled less per volume unit. If the flow rate decreases it will result in a smaller quantity of oil being cooled more per volume unit. When the cooled oil is mixed with that remaining in the crankcase it should be close to a wash.
2014 Passat Wolfsburg, 1995 Miata.

#4527822 - 09/27/17 06:45 PM Re: Flow Rate and Oil Cooler????? [Re: redneck47441]
CT8 Offline

Registered: 10/09/14
Posts: 10925
Loc: Idaho
The filter bypasses, how would the flow rate increase?
"Don't let your preconceived notions get in the way of facts."
Geoff Metcalf

#4527991 - 09/27/17 10:18 PM Re: Flow Rate and Oil Cooler????? [Re: redneck47441]
ZeeOSix Offline

Registered: 07/22/10
Posts: 17763
Loc: PNW
As long as the oil pump is not in pressure relief, which is 99+% of the time, all the oil volume coming out the pump goes through the filter and the engine. So the filter therefore has no effect on flow to the engine in this case of pump not in relief.

The guys on the other forum sound like they don't understand positive displacement oil pumps and how oiling systems work.

#4528122 - 09/28/17 05:53 AM Re: Flow Rate and Oil Cooler????? [Re: redneck47441]
dnewton3 Offline

Registered: 05/14/07
Posts: 7389
Loc: Indianapolis, IN
Oil filters will, generally, flow far more than the engine pump will deliver. There is a flow relationship between rpm and pressure for a positive displacement pump system such as nearly all vehicles have. That is augmented by the pump relief at times, as Zee mentioned.

Anyone who believes that a traditional FF oil filter is the metering device for lube flow is NOT a credible source.
The act of preventative maintenance, in and of itself, is FAR MORE important than brand/grade/base choices among lubes and filters.
- under maintaining something is akin to abuse/neglect; that can kill equipment by shortening the lifespan
- over maintaining something has never been proven to be anything but a waste of time and money