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Old 07-25-2007, 10:12 AM   #1
Slowsoul
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Default Switching Between Synthetic and Non-Synthetic Oil

Once I have gone over to a synthetic oil, is it okay to switch back to a non-synthetic oil?
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Old 07-25-2007, 10:34 AM   #2
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I was told, that you "shouldn't" however, I've read on this site, and few others that there really isn't any danger in doing so. I think it's a myth honestly.
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Old 07-25-2007, 10:57 AM   #3
rkramer
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it used to be true when synth first came out. now switch all you want, your car doesn't care.
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Old 07-25-2007, 11:35 AM   #4
skibumm3
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Is switching to synthetic oil worth it? I have been thinking about doing it with the new engine. I know they say you should do it before your engine has 20,000 miles on it. So is synthetic really that much better then regular oil?
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Old 07-25-2007, 12:25 PM   #5
Sir-Knight
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depends on the driving conditions you go through. My car is 95% city driven, so that's really hard on the car. I use amsoil synthetic and burn about 1/2 qt between changes. Mineral oil was burning almost a full qt.
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Old 07-25-2007, 12:27 PM   #6
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better gas mileage and less need to do frequent oil changes are my reasons for sticking with synthetic.

after reading the faqs and talking with subaru, you can switch to synthetic but preferably after a few thousand miles on your car
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Old 07-25-2007, 12:41 PM   #7
wrx4meinnd
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i live in the arctic, i mean in north dakota. so i have harsh conditions from 100+ temps to less then -60 degrees. so choice of oil is a key up here. i use a synthetic blend and have never had a problem. the advantage to that is a synthetic blend will mix with the condensation(water) your engine makes while going hot to cold back to hot...ect. a full synthetic will not do that. but the amount of water accumulated in the motor will not affect your car unless you hit the bitter cold that the northern areas can hit, up here oil pumps can freeze(rare but happens) and your bearings will be sprayed with water first instead of oil. so if you plan on bein damn cold then a blend is good for you.
my .02
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Old 07-25-2007, 01:44 PM   #8
rkramer
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Quote:
o choice of oil is a key up here. i use a synthetic blend and have never had a problem. the advantage to that is a synthetic blend will mix with the condensation(water) your engine makes while going hot to cold back to hot..
blends are generally considered about the worst oils to buy. Notice they don't specify the percentage of synth/regular? you might be paying substantially more for .005% synthetic oil, there is no regulation regarding it, and nobody releases #'s. You still get all the disadvantages of dino oil that synth is supposed to take care of.

also, as far as mixing with water, it doesn't matter if it is synth, blend, or straight dino. oil+water != mixing. (I'm in ND also... i run castrol synth in the wrx and snowblower/tractors, the other vehicles get straight dino. never had a problem)
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Old 07-25-2007, 01:56 PM   #9
BlackPearlX
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As long as you dont mix them, It is okay to go back and forth...

I still use reg oil, but i might switch in the future...

I would advise you to send your oil for analysis to correctly estimate when you need to change it, instead of thinking 5k would be okay...
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Old 07-25-2007, 01:59 PM   #10
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It sounds like ND climate was made for synthetic oil. Or maybe it is the other way around.

To avoid water in oil you need to reach high enough temperature so it vaporizes. Then PCV valve is your friend.

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Old 07-25-2007, 02:23 PM   #11
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Quote:
Originally Posted by BlackPearlX View Post
As long as you dont mix them, It is okay to go back and forth...
Methinks you are spreading incorrect information.
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Old 07-25-2007, 02:25 PM   #12
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You can go back and fourth, mix them, it doesn't matter. Oil is oil. They are not going to combine and blow up or anything, lol. I have mixed lots of different oils without any problems at all.
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Old 07-25-2007, 03:38 PM   #13
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Yeah it doesnt matter. As long as its the correct viscosity you'll be fine. Oil just lubricates the motor.
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Old 07-25-2007, 03:39 PM   #14
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Will I be ok to change my car to synthetic, engine has 14k on it now?
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Old 07-25-2007, 06:37 PM   #15
Slowsoul
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In my case, my WRX has 84k on the motor. The owners manual has a note from the original owner stating that he switched over to synthetic oil as soon as the car was done breaking in, so it has pretty much always had synthetic oil in it. I have a few reasons that I would like to try a dino oil for the next oil change interval, which is coming up here shortly, and I had heard a few different opinions as far as mixing synthetic fluids is concearned, so I thought I would post to find out what people here had to say.

Thanks for the input.
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Old 07-25-2007, 07:21 PM   #16
skydes
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Do a google search or even better, call Subaru tech support and ask them yourself. Record the conversation and either post a transcript back here or post a link to the conversation.
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Old 07-25-2007, 08:21 PM   #17
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There is an Oil FAQ in the Maintenance forum.
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