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Old 12-01-2003, 01:37 PM   #1
Scooby Newbie
Member#: 39983
Join Date: Jul 2003
2003 WRX Wagon

Default Milage problem: Did i use the right Purolator PureOne Oil Filter?

Hey guys,

As with any new car owner, i was anxious to do my own car work starting out with my 4800km oil change.

I went and got myself a purolator pureOne oil filter (PL14460), as recommended on Purolator's website (www.pureoil.com) for my 04 2.5TS. I noticed it was the same partnumber as the one that goes on the WRX which of course has a totally different engine.

I didn't think much of it, installation went clean as a whistle, put in some 5w30 oil (cold winter up ahead), and went on driving as normal. I noticed the engine was much smoother afterwards and i was loving the car again.

But I've been tracking my gas milage religiously since the beginning and I've noticed my milage has worsened noticably.

I used to get (before the oil change) about 10.50L/100Km, or almost 23mpg, but now i'm getting close to 12L/100km, or 20 mpg... I'm doing averages and driving pretty much exactly the same(mix of highway and city but mainly city) (and more conservatively now)

So my simple concern is: why is my milage getting worse? is it because of the filter? or is it because of maybe the dreaded "winter-gas" that supposidly gets worse milage... or would overfilling the oil cause this (which isn't the case, i'm right on F on the dipstick on a warm engine)?

Any insight would be appreciated!
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Old 12-01-2003, 03:28 PM   #2
Scooby Guru
Member#: 6551
Join Date: May 2001
Chapter/Region: MWSOC
Location: Carol Stream, IL
'01 GC8 Dinged STM
'09 Concours 14 ABS Black


it's not the filter, the filter is the same for all subaru's, welcome to the world of the EJ25 and it's poor mileage
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Old 12-01-2003, 03:44 PM   #3
Scooby Specialist
Member#: 32617
Join Date: Feb 2003
Chapter/Region: Tri-State
Location: NY
2008 STi


could be the gas, i've noticed my mileage is a little down as well lately, and i've been using the same oil filter and 5w-30 mobile1 trisyn since june, bet its a combination of winter gas, and maybe a small change in tire pressure due to the cooler weather, just checked my tire pressure and my mileage is up 1-2 mpg from the last tank
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Old 12-01-2003, 04:30 PM   #4
Scooby Newbie
Member#: 39983
Join Date: Jul 2003
2003 WRX Wagon


doh, i feel like an ass spelling mileage wrong..

anyways... Good point about the tire pressure.. I haven't checked it since it started getting cold. And i'm a little relieved the oil filter is good cause i bought a case of them

Just wondering as well... with overfilling the oil, what are the usual symptoms?
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Old 12-01-2003, 08:04 PM   #5
Scooby Guru
Member#: 2278
Join Date: Sep 2000
Chapter/Region: NESIC
Location: Pepperell MA
8Sti | 07 allez
White | Comp


cold winter up ahead
You are most likely now running on winter gas, which contains additives that reduce the likely hood of it freezing, and your milage. Also, with cold weather, the car tends to run quite a bit richer due to 2 factors, cold dense air, and needing added fuel during warm up.
just a theory, but the filer isn't going to cause fuel milage problems...
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Old 12-01-2003, 10:06 PM   #6
Scooby Specialist
Member#: 9386
Join Date: Aug 2001
Location: H-Market, VA & JMU
2000 2.5rs sedan


I usually average at least 330 miles to a tank and it is "heavily" modded. The manual says it has a 15 gallon tank (i think), but even when I'm runnin on fumes I've never been able to fill it up more than 13 or so gallons.
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Old 12-02-2003, 08:22 AM   #7
Scooby Specialist
Member#: 21293
Join Date: Jul 2002
Chapter/Region: MWSOC
Location: Oak Park, IL
05 OB Black Bean
1969 W-30

Default Oil Level

If the oil level is too high it will foam. The crank will turn through and aerate the oil. In the Subaru I am not sure at what quantity that happens. After driving, check the oil and if there is not foam on the dip stick I would say you are fine.

I would say you mileage is gas also. We just did a trip for Thanksgiving and when we got out of the city the mileage picked up by 2-3 mpg. Got out to where gas is still gas w/o corn and it picked up another mpg.


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