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Old 06-27-2008, 01:03 AM   #1
sky44
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Member#: 178333
Join Date: Apr 2008
Location: Loveland CO
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2005 OBS 5MT
green

Default anybody here mess with a bypass oil filter?

http://www.uspiautomotiveoilfilter.c...847/page/45029


seems like kind of a good idea. it basically circulates about 10% of your oil's flow through a super fine filter trapping the tiniest particles. the rest is free to go through the normal filter. oil pressure is unaffected, as all the oil isn't forced through this filter. it ups your system's oil capacity as well.

in my experience with modern cars the engine is about the last thing to go though.
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Old 06-27-2008, 06:38 AM   #2
Unabomber
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Location: I can save you a ton of cash
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on car parts so PM
me b4 j00 buy

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You checked out the price? My nose is bleeding. It's a great and sane idea for a vehicle that is going to run 100,000 miles a year like a semi or fleet vehicle. For a passenger car it's a terrible waste of money except for maybe HIGH end engine build. It's your money, but the cost/benefit analysis isn't there considering most people get rid of cars around 100-200K miles and the selling point of these is for vehicles being used more than that.
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Old 06-27-2008, 09:53 PM   #3
bulwnkl
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2005 Black Tiger
(Black Turbo Baja)

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I've used an Amsoil bypass system on a passenger car before (a Neon). Bought it used, so it wasn't so expensive. OUTSTANDING UOA on a long drain with Red Line oil. Still, I removed it because I got scared of where it was mounted and the potential for overheating the oil (wasn't happening, which I discovered through the UOA, but it was too late).

There's more to think about than just bolting one on. You need to understand that installing a bypass system reduces flow to the engine somewhat, so you must be certain that you have that extra capacity in your oil pump. There are also many other things that can cause you more harm than good to do with installation, mounting, hose length, etc. Whether it's cost-effective depends on a bunch of things that are probably too variable to answer with a generality, but I suppose I don't know for certain.

IF you use a good system, have a good installation, and have sufficient extra oiling system capacity, it will definitely improve your UOA results. That may still not show up as a benefit until 950,000 miles, though.
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Old 06-27-2008, 11:40 PM   #4
sadsack
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The other advantage to a bypass filter accrues under "short duty" conditions.

Unless you're driving a car long enough for water condensation to boil off from the oilpan (~20 minutes), you run the risk of having this condensation promote the formation of acids which can corrode engine surfaces.

A bypass filter using a large TP filter element will trap much more of this condensation moisture than the OEM full-flow filter.

As has been mentioned previously, in situations where oil temperatures are a concern, then a BP filter may be questionable. However, when insufficient oil temps are a concern (due to insufficient condensation boil-off mentioned above), the argument for incorporating a BP filter is in fact strengthened.

I'm considering a BP filter myself - I recently moved to a smaller town, and my commute is 5 miles. This short a commute is insufficient to boil off moisture condensation.
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Old 06-28-2008, 03:08 PM   #5
bulwnkl
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Quote:
Originally Posted by sadsack View Post
...in situations where oil temperatures are a concern, then a BP filter may be questionable. However, when insufficient oil temps are a concern (due to insufficient condensation boil-off mentioned above), the argument for incorporating a BP filter is in fact strengthened.
Be careful with this concept. Toilet paper may indeed trap water without 'messing up' the filtration capability of the medium, but there is room for some dispute there. Plus, the way MOST bypass filters work, low oil temps are made much worse by the bypass filter because of the increased volume and removal from the heat source. I was concerned about high oil temps because the only convenient place I could mount mine on the Neon was directly above the catalyst, and without any heat shielding. The reality of it was probably exactly the opposite of what I was thinking. It probably either had no impact or else improved things by making sure the oil didn't drop out of target temperature range.
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