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Old 05-08-2008, 02:34 AM   #1
Scooby Specialist
Member#: 66480
Join Date: Jul 2004
Chapter/Region: NWIC
Location: Renton, WA
2001 Wrx wagon

Default Changning to synthetic

Well, i just picked up a 93 legacy Sport Sedan, that has about 163k miles on it. Its a turboed car, and i feel that it would be able to reap the benefits of using synthetic oil. But is it too far along in its life to do that??

I hear changing to synthetics this late in life lead to broken gaskets. And if not, how should i go about doing it? i.e. Change to synthetic, run for 1 tank, then change oil again, do it once more. then do normal changes after that?

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Old 05-08-2008, 02:45 AM   #2
Scooby Specialist
Member#: 131193
Join Date: Nov 2006
Chapter/Region: MWSOC
Location: Michigan


Its hard to say what synthetic will do for your motor at 163k miles. I think it really just depends on how the motor has been treated those 163k miles. I.e. oil changed at the correct intervals for the type of load/driving that it has seen.

Changing to synthetic is as simple as fully draining the oil and adding the synthetic. Run it until your next oil change. You can also use a flush such as Amsoil's, if it makes you feel better. Changing an engine from synthetic to standard is a little more tricky. You have to ween it of like a heroine addict.
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Old 05-08-2008, 03:28 AM   #3
Arctic Penguin
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Join Date: Jul 2006
2006 WRX


if the syn oil dislodges old sludge chunks and that sludge blocks oil passages in the heads it could kill it
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Old 05-08-2008, 10:30 AM   #4
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Member#: 767
Join Date: Jan 2000
Chapter/Region: Tri-State
Location: N.J.
04 FXT


I would try a High Mileage oil. A regular full synthetic would probably clean your engine too well, like the Penguin said.

With High Mileage oils you can go conventional (Pennzoil, Castrol GTX), synthetic blend (Valvoline Max Life), or full synthetic (M1 HM or MaxLife Full Synth). I would probably go with Max Life blend.

Regardless of the marketing hype, most HM oils are thicker at operating temp. and have beefier additive packages.

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Old 05-08-2008, 11:54 AM   #5
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Member#: 88288
Join Date: Jun 2005
Chapter/Region: NESIC
Location: Central MA
.... At this point,
even I have lost track.


As stated above, I would go with a High Mileage regular dino oil. Honestly, with that many miles, I would not change over to synthetic at this point.
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Old 05-14-2008, 01:47 AM   #6
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Join Date: Apr 2008
Chapter/Region: South East
06 WRX


what about @ 95k?
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Old 05-14-2008, 03:14 AM   #7
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Join Date: Nov 2006
Chapter/Region: MWSOC
Location: Michigan


I believe it would be the same grounds as stated above. It really depends on if the thing had frequent oil changes based on the type of driving conditions that the motor seen. 9 times out of 10 people just replace the oil at 3,000 miles or around that. That has been the "standard" thinking for yeearrsss.. But people don't realize if you beat the **** out of a motor, you need to change the oil more often.

My motor had regular oil changes up to 50k when I purchased it. It never seen any synthetic oil until me owning it. I put Mobil 1 in (because I needed a change quick and it was available easily). Now the lifter tick is quite a bit louder, which I expected.
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Old 05-14-2008, 05:17 PM   #8
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At 163K miles, I would probably stay with regular dino-oil or the High-Mileage oils.

Just do your oil changes on a regular basis.
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Old 05-21-2008, 06:35 AM   #9
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Member#: 179124
Join Date: May 2008
Chapter/Region: RMIC
Location: Prosville, Utah
1993 Legacy L Sedan
Purple red or something

Thumbs up changing to synth...

I actually just barely did it about 200 miles ago, granted this is still a small measurement of how long its been in there, but its helped imensely with the clicking lifter/valve noise so I can not say how it will be in the long run, but I'll definitely keep track of how its doing...and change my filter...I hate fram :P
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Old 05-21-2008, 11:17 PM   #10
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Join Date: Feb 2002
Location: san francisco, ca
90BJ Legacy LS ABS
AWD 946 Rio Red Jpn built


Why are all of these first generation Legacy owners "wasting" time on Nasioc? I promise you will enjoy http://bbs.legacycentral.org/index.php much much more

I switched three of my own high mileage legacy to synth, 90 at 120k, 91 at 140k, 95 at 210k plus a few other makes (including a Del Sol with 210k).
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