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Old 12-10-2005, 07:23 PM   #1
trbowrx
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08 STi
04 536whp STi Sold!

Default Oil Question?

Well here is the deal.... i have a sti that i bought used from a member on this forum (Backedcookies) and he used just regular oil in his car since he got it instead of synthetic. now in my 2002 wrx i only ran Mobil 1 synthetic, and i was wondering if i would cause some damage by switching over to synthetic? the car has 37000 miles on it and does not have a oil burning problem. so just some input would be nice on a good oil to use or a good non synthetic oil? thanks so much.

Paul
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Old 12-10-2005, 07:58 PM   #2
WR^2X
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You'll probably be fine switching to synthetic. 87,000 miles would be a different story.

Use Mobil 1.
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Old 12-10-2005, 08:07 PM   #3
volkl23
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you'll be fine. 37k is still young for an engine.
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Old 12-11-2005, 12:03 AM   #4
mystiwip
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i switched to mobil 1 at 5k, after knowing that the sti burn oil (mobil 1) like its drinking water, i went back to use the regular oil
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Old 12-11-2005, 12:06 AM   #5
WR^2X
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Interesting... I switched at 10K and mine doesn't use a drop.
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Old 12-11-2005, 12:48 AM   #6
Helium
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Default Synthetic switch

Why is it bad to switch after such high mileage? I have 20k and I am thinking about switching on my next change, but I am unsure at the moment if I want to do that..
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Old 12-11-2005, 01:04 AM   #7
Idahoser
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If you change your oil when it first turns color whatever the mileage is and dont run it dirty and grunge up your insides you should be able to go synthetic whenever you want to. 5 K isnt enough dino time to seat the rings properly- I usually wait until 10. I have an older dodge pickup here that has 150 K on it and we had to refresh the rear main at about 90- outside of that its perfect inside. Cam, bearing inserts, valve seals all look like new and the previous owner ran synthetic only after the initial break in. Does not use a drop of oil. Granted synthetic does not have the viscosity of regular oil so you tend to lose pressure- but its worth it.
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Old 12-11-2005, 01:11 AM   #8
silverlegacy
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My lgt doesn't burn a sip, and i put in amsoil at 1500
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Old 12-11-2005, 07:25 AM   #9
005sti
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"Q" quaker state 10w-30 full synthetic
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Old 12-11-2005, 12:29 PM   #10
ivwarrior
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Quote:
Originally Posted by Idahoser
5 K isnt enough dino time to seat the rings properly- I usually wait until 10.

I hear this alot, but is there really any truth to it anymore? Don't the Chevy Corvette and some others come from the factory with synthetic?
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Old 12-11-2005, 12:56 PM   #11
poison
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Default

So much disinformation in this thread, geez. Ya'll need to head over the www.bobistheoilguy.com to bone up on oil facts.

You can switch to synthetic anytime after, say, 5-10k (depending on who you choose to believe) all the way up to 100k+. How your engine responds is a matter of the individual engine, how its been driven, what oil was used and at what intervals, etc.

Many times a late switch to synthetic will start a leak. People panic and return to dino (regular) oil. The fact is that dinos can sludge; and synths burn much cleaner and have more detergents. So many times the superior cleaning power of the synth cleans sludge out that was plugging leaks from shrunken or aging seals and gaskets. A leak starts, of course, and the oil is dumped in panic.

If the synth had been left in for 2-3 oil change intervals, the conditioners in the synth would have plumped up the old gaskets and stopped the leak, all the while providing a cleaner engine and superior protection.

What do you guys think: that if you put in synth and there's a slow leak, your car will implode? Just give it a couple OCI's to give the synth time to work. If, in the end, it doesn't, go back to dino. But at least try to take advantage of synthetics superior protection.
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Old 12-11-2005, 08:44 PM   #12
Idahoser
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Thumbs up

I agree totally. If its good enough for the friggin space shuttle- its good enough for me.
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Old 12-19-2005, 08:21 AM   #13
BakedCookies
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Quote:
Originally Posted by trbowrx
Well here is the deal.... i have a sti that i bought used from a member on this forum (Bakedcookies) and he used just regular oil in his car since he got it instead of synthetic. now in my 2002 wrx i only ran Mobil 1 synthetic, and i was wondering if i would cause some damage by switching over to synthetic? the car has 37000 miles on it and does not have a oil burning problem. so just some input would be nice on a good oil to use or a good non synthetic oil? thanks so much.

Paul
Paul, I dont recommend switching, when i ran it the car was drinking a quart every 2-3 weeks. Switched back to dino and the issue went away. I have read numerous threads that suggest never running synthetic in an STi
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Old 12-19-2005, 11:42 AM   #14
poison
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Default

Quote:
Originally Posted by BakedCookies
Paul, I dont recommend switching, when i ran it the car was drinking a quart every 2-3 weeks. Switched back to dino and the issue went away. I have read numerous threads that suggest never running synthetic in an STi

You're kidding, right?

I bet you ran Mobil 1, huh? If you paid attention, you'd read that Mobil 1 disappears very quick in many Subarus. It's thin and shears down quick. But that's no reason to switch to an inferior dino in a what is essential a race car with a highly stressed turbo-charged engine (though subarus have excellent design and are not as highly stressed as some).

You should've either 1) kept topping off the same oil, or 2) switched to a better synthetic for your application (novel, huh?).

Assuming the car is not ****ed up in some way, I'd put money that GC 0/30 or Mobil T&S 5/40 would NOT lose more than a half-1 quart over 5k of normal driving.
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Old 12-28-2005, 07:49 PM   #15
NjRx7T2
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Subaru Stars

Well, I drive an 05 STi and my dealer does my oil change free for life and I was told they used the regular oil... Here's the thing, I'm gonna be doing my own oil change comes spring time for more aggressive driving (on the track, of course! ) and I'm planning on using perhaps the Quaker Synt. Now, is there gonna be a major problem other than the usual leaking? I now have almost 10k miles so that means my car will have about 13k miles after 3 months.. Is it even recommended to do so at this point? What will be the affect of switching back to regular oil (remember, free!) when winter comes again? Thanks for the input!!


Chad of Nj.

Last edited by NjRx7T2; 01-06-2006 at 03:51 PM.
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