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Old 08-25-2000, 06:34 AM   #1
DLC
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Member#: 1964
Join Date: Jul 2000
Chapter/Region: RMIC
Location: 84XXX
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01 BH
Blue/Bronze

Post Synthetic at 90k miles

My 93 doesn't leak a bit, unlike my 90, and i'm seriously considering switching over to a full synthetic oil, probably Mobil 1.

It's expensive, but so is a new turbo.

With the problems it can create with seals, will i be safe switching over at this point? I'd hate to have a sealed motor start springing leaks just because i wanted to do something nice for it. Has anyone here switched over at a relatively high mileage?
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Old 08-25-2000, 07:11 AM   #2
OG
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2000 Silverado

Lightbulb

I switched my '93 L at ~115k and yes the leaks I had got a little worse. I think you should be O.K. as long as the motor has been well maintained thus far. If it's not leaking at all Idon't think it will spring a leak overnight but I would watch closely if you do switch. IMHO the benefits outweigh the risks especially in a cold climate.


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Old 08-25-2000, 07:18 AM   #3
DLC
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Well in Utah it's 90-105 most of the summer but in the winter it can stay right at, or below, freezing for a month at a time. We get terrible wind storms that really being the chill down.

I'm going to look it over close for leaks again and switch to synthetic next change.
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Old 08-25-2000, 07:41 AM   #4
Shik
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Dave, I have over 123k miles and I've been using synthetic since I got the car(90k) and I have no leaks. Even if you do have a few leaks, I don't think synthetic will make a gigantic difference. I also don't think that if a seal is in good shape, synthetic will make it go bad. However, if a seal is in so-so condition, it's going to leak sooner or later no matter what you are running, at which time it should be replaced.

The oil pump seal and front main seal are the two biggies. Next time you have the T-Belt done, have those seals done as well. All in all, I totally agree with OG in that the advantages of synthetic oil far outweigh the disadvantages. I wouldn't worry about it too much. FWIW, I use Mobil 1 10w30.
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Old 08-25-2000, 08:04 AM   #5
GTBGUY
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DLC - I switched over to synthetic on both of my Legacys ('98L and '99GT) since they had 4000miles on them.. I'm using the Motul 8100 E-tech 0w40 Full synthetic... and so far I've extremely happy with them (engine starts will easy in -25C temperatures) If you switch to synthetic your leak will still happen, but you won't have to worry as much about loosing the oil since synthetic binds to the cyl. walls... thus providing some protection even if all the oil leaks out.
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Old 08-25-2000, 08:36 AM   #6
DLC
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Thanks for the input.

Since Ogden never gets to -25c i think i'll stick to the 10w30 stuff

Usually the seals to go are the Oil Pump and Camshaft, easily replaced when the timing belt is being done. I'll have that done in 5-7k. Thank goodness for Non-Interference engines
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Old 08-25-2000, 08:06 PM   #7
Flatfour
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2 more cents,
I switched to full synth in my Turbo at 75K, but then I change the front seal every time I do the belts, too simple and too cheap not to.
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Old 08-26-2000, 03:11 PM   #8
AWDBat
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Yo DLC,
I've got about 75K on my 95 Legacy and plan to start putting synthetic in at the next change. I'll let you know if my leak begins to worsen, but if the performance improves...!
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