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Old 07-30-2002, 08:07 PM   #1
IggDawg
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Question switching to synth oil at high miles?

I'm getting a '97 L with an EJ22 at 67,XXX. Do I have to worry about swithcing to synth? she burns no oil yet and I'd like to keep it that way. do I need to worry about the synth oil eating the seals?

-IggDawg
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Old 07-30-2002, 09:36 PM   #2
Fred Zaplitny
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I copy and pasted your question in to Google since I was bored and interested.

http://www.google.com/search?hl=en&i...=Google+Search

enjoy.

Fred
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Old 07-31-2002, 10:24 AM   #3
Subie Gal
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heya...
i've got the 1.8 95 rally car... 110K miles and counting...

when i got him he had 3 oil leaks...

rear main , rrcam seal and front main...

after replacing everything i thought about going synth...
i was told this by my rally mechanic....
dont do it!
synth runs so thin that if there are any inklings of an oil
leak, it will find them... and then you have ANOTHER leak.
this applies to older cars with many miles...
it's just not advisable...

i thought it would be a bad thing as i may send
my poor lil car into shock!!!

Jamie
www.subiegalracing.com
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Old 07-31-2002, 02:38 PM   #4
ciper
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Its true that switching to synth can show leaks. I believe you should do it.

I switched my ej22 when it had about 120k to synth. Now I have leaking valve covers. I still use it though because the mileage increase saves more money than the cost of the oil.

Besides, if its using less gas its obviously more effecient so why not do it?

Saying not to use synth because you may get leaks is like telling someone not to use the breaks because you know they are already worn.

edit: oh I now have 139xxxk miles and only the valve covers are leaking (knocking on wood). The amount that leaks is probably a few tablespoons between changes so its not an issue until I go for my timing belt/water pump/oil pump change.

Last edited by ciper; 07-31-2002 at 03:17 PM.
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Old 07-31-2002, 03:13 PM   #5
Tim Smith
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Iggy, my man, just do it.

Seriously, it will only help.

Tim

P.S. 67K miles is not high miles, 267K miles is high miles.
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Old 07-31-2002, 03:32 PM   #6
beethoven
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Blah, blah, synthetic, blah blah.

204,000 miles on my 93 Legacy and it has never seen a drop of synthetic oil. The only oil-related problem I've had was when the backing plate on the oil pump seperated slightly at 185,000 miles and leaked a little. The parts guy said that wasn't uncommon on high-mileage Subarus.

Between my Dad and I, we have over half a million miles on Subarus without synthetic oil and no leakage problems. Don't believe the myth.
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Old 08-01-2002, 08:57 AM   #7
HIHO
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I had the same questions and I did ALOT of research into the subject. What I found was that syn. would not cause leaks and in some cases can even help syop them. Syn. will actualy help soften seals that dino has ruined. The reason syn. got a bad name was that early formulas had to much and to harsh a detergent added. This would rapidly clean the sludge from around the seals etc. before the syn. had time to resoften them. Now the formulas use a less harsh approach. Well I switched about three weeks ago(67,545) to Mobil 1 10w-30. I have gotten under the car with a flash light several time and have not seen a drop yet. I ran a autox this weekend too. I agree with Tim Smith 67k miles is not high. I noticed no power gains but could hear the difference. The engine is much quiter at idle. I got mine at Walmart, 5 quarts for $17.88. I change my wife's CRV oil yesterday(72,000) with Castro Syn. It was only $14.67 for 5 quarts. The price is right on syn. so why not do it. I believe that a car can last a long time on either dino or syn. With the research I did I found testimonies of engines(ran on syn.) with 200k miles being opened up and looking brand new. One guy said he rebuilt his engines when they hit 200k and they needed it. He said the first time he rebuilt a motor ran on syn, he was amazed, it didn't need a rebuilt.
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Old 08-01-2002, 01:06 PM   #8
ciper
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beethoven:

I drive about 550 miles a week. I have a pile of receipts from the gas station with the mileage wrote down. Everytime I top the car off until the fuel is visiable above the little door. Because of this I have very precise mileage records.

After switching to only synthetic oil i was getting about a 5% increase in economy. Now that I have switched to synth in the both diff, transmission and even the power stearing Im seeing an increase of about 8%.

Translated thats about 20mpg at 80mph with many WOT merges before and 22.5mpg after with no change in driving style.

These measurements have been made over many tanks of gas so Im very sure of the results. This being said, can you argue not to use synth oil? If my car is using less fuel does that not mean MORE power applied to the wheels and less pollution?

Also realize Im using 15w40 oil. Imagine the difference if I used 0w-30 like many do.
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Old 08-01-2002, 04:29 PM   #9
RaceCarRiot
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i put mobil 1 in my car when i bought it last may with 80,000mi on the clock, and after 2 oil changes (7000mi), it absolutely KILLED my oil pump seals, and the seals on the front of the engine. you'd never actually SEE oil under the car or leaking out anywhere. but you would smell it burning when driving the car hard. when the seals died and had to be replaced, we were obviously going to drain and change the oil, and when i saw how much drained out, i nearly shat myself -- the only oil in the engine was what was in the FILTER.

i switched back to dino oil that day, and 25,000 miles later, it doesn't use a single drop...even with repeated trips to redline daily in hot weather, cruising at 90+ on the highway, etc.

so, no, i wouldn't advise using synthetic...even if i buy a new car, i *highly* doubt i will ever use it again. but to it's credit, even with the engine running with that little oil in it (for god only knows how many miles), there was no damage whatsoever. be careful...

-adam-
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Old 08-01-2002, 06:53 PM   #10
HIHO
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Quote:
Originally posted by RaceCarRiot
i put mobil 1 in my car when i bought it last may with 80,000mi on the clock, and after 2 oil changes (7000mi), it absolutely KILLED my oil pump seals, and the seals on the front of the engine. i switched back to dino oil that day, and 25,000 miles later, it doesn't use a single drop...even with repeated trips to redline daily in hot weather, cruising at 90+ on the highway, etc.

-adam-
Sorry, but that is just hard to believe. If you where losing oil that bad dino won't help the problem.
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Old 08-02-2002, 08:27 AM   #11
RaceCarRiot
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Quote:
Originally posted by HIHO


Sorry, but that is just hard to believe. If you where losing oil that bad dino won't help the problem.
i had a hard time believing it as well, but i had NO problems with oil loss before switching, and haven't had any since switching back.

i'm not saying this is what WILL happen if someone switches to synthetic, but rather telling people what happened when i switched to it at a moderate number of miles...your mileage may vary of course, but i'd hate to see someone run their engine dry unneccessarily.
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Old 08-02-2002, 03:52 PM   #12
gavin
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Bottom line, do what you're comfortable with. Everytime you ask a question like this, you're going to get a raft of responses with anecdotal love it/hate it experiences.

My understanding, after a lot of research, and my experience is that switching to synth, in a properly maintained engine, at any mileage is not going to do any damage. What will happen is any existing leaks that are clogged with deposits will be cleaned out, and will leak. And, due to the smaller molecular structure, and higher pour rate of synthetic, they'll leak faster.

You will see some MPG gain, but not huge. And, frankly, you could run the worst $1 a quart dino on the shelf, and still get 200k miles out of your engine, if you're changing it every 3-5k miles.
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