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Old 08-07-2003, 11:50 PM   #1
Stilletto
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Default Switching Back From Synthetic?

Anybody heard of any kind of "no going back once you cross over" rule or anything?
Need to do an oil change but can't afford the mobil 1 syn this time...ok to go with a blend or dyno for a break?
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Old 08-08-2003, 12:04 AM   #2
WRX_02_227
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From what I have heard once you go synthetic you cant switch back. I dont know why but thats what they say.
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Old 08-08-2003, 12:28 AM   #3
PaulRex
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That sounds like nonsense to me honestly.. use the regular, change your oil/filter at 3k miles like usual, and you will be fine
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Old 08-08-2003, 01:40 AM   #4
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FWIW, I switched back after two oil changes with synthetic and had no issues.

josh
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Old 08-08-2003, 02:05 AM   #5
samowrx
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dealer offered me a free oil change but i told them that i was bringing my own oil. they used dino oil and there was no leaks. i'm back to synthetic again.
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Old 08-08-2003, 02:16 AM   #6
drees
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No issues switching back and forth between synthetic and non-synthetic, it's an old wives' tale.
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Old 08-08-2003, 02:50 AM   #7
CirrusWRX
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I've heard similar.

And sorry to get OT, but why is it that these old wives spread so many darned rumors?! I swear - these married women get old and have nothing better to do than make up the MOST BIZARRE tales and pass em around.
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Old 08-08-2003, 12:49 PM   #8
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I wouldn't completely rule it out as an "old wives' tale"...have you ever heard of a procedure to switch from regular to synth? I don't remember at this time where I read that, but I would assume it works both ways.....but maybe not?
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Old 08-08-2003, 01:19 PM   #9
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You can switch back and forth. You can even mix Mobil 1 with conventional oils.
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Old 08-08-2003, 01:38 PM   #10
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Many years ago you couldn't switch back but todays synthetics you can. It's not an old wives tale, just not valid anymore.
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Old 08-08-2003, 02:05 PM   #11
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The thinking was that the gaskets swelled more with dino oil. When you switched from dino to synth the gasket whould shrink causing oil leeks.

I do not think is the case anymore ( or every was?)
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Old 08-08-2003, 04:05 PM   #12
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Read the back of the bottle of any synthetic, it should say somewhere "fully compatible with all SAE oils" or something like that.

If they weren't compatible and they caused problems, we would have heard about the lawsuit by now. In all honesty, your biggest issue will be possible paraffin and sulfur content in whatever conventional oil you switch to, not the small amount of synthetic that would be left in the motor after a change. Even then, it takes pretty hard use, neglect, and time to get that to be a problem.
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Old 08-08-2003, 04:36 PM   #13
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i switched to synthetic at 1400 miles and am now at 13K i was thinking of going back to dino oil to make sure my rings are seated properly.....maybe i'll try that at my next change and run on dino oil for another 1000 miles or so...
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Old 08-08-2003, 05:04 PM   #14
drees
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Quote:
Originally posted by Kwyjibo
i switched to synthetic at 1400 miles and am now at 13K i was thinking of going back to dino oil to make sure my rings are seated properly.....maybe i'll try that at my next change and run on dino oil for another 1000 miles or so...
Are you burning much oil? If not, I would not worry about it.

Either way, one interval of dino will not hurt, either.

-Dave
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Old 08-08-2003, 06:17 PM   #15
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The only document issue is switching from dino to synth on a high-mileage engine. The additional detergents in synth will clean out a lot of the impurities that have built up over time and possibly cause leaks. I switched from dino to synth on my GSR with 80K miles and had to replace a cam seal after it started leaking.

Any issues switching from synth to dino are wives tales and folk lore as others have stated.

Jimbo
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Old 08-08-2003, 06:48 PM   #16
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Quote:
Originally posted by drees
Are you burning much oil? If not, I would not worry about it.

Either way, one interval of dino will not hurt, either.

-Dave
i burn about a quart between oil changes, but i drive the car hard so maybe that's why....
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Old 08-08-2003, 10:08 PM   #17
drees
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Quote:
Originally posted by Kwyjibo
i burn about a quart between oil changes, but i drive the car hard so maybe that's why....
How many miles between changes? If you drive hard, and got on it a bit during the first 1k miles, the engine is likely are broken in as it's going to get...
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Old 08-08-2003, 10:12 PM   #18
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Quote:
Originally posted by drees
How many miles between changes? If you drive hard, and got on it a bit during the first 1k miles, the engine is likely are broken in as it's going to get...
nah, around 10k or so
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Old 08-08-2003, 10:16 PM   #19
drees
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Quote:
Originally posted by mlambert
nah, around 10k or so
Really takes that long for the EJ20 to fully break in?
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Old 08-08-2003, 10:18 PM   #20
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Yea give or take a few K. Mine was rode hard and put away wet and fuel economy still increased around 10k.
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Old 08-09-2003, 12:39 AM   #21
Stilletto
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Man, you guys have been great....i am feeling no fear about switching to dyno now....just between paychecks and it's time for a change...then back to synth probably for good....Good info...
This is what this board is about!
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Old 08-09-2003, 04:47 AM   #22
WRX03
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Old versions of synthetics use to ball up in old versions petroleum clogging passages. Some 2-cycle oils and caster still do this.
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