Changing to synthetic motor oil

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Feb 4, 2004 | 10:10 AM

BlueSti389

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Changing to synthetic motor oil

I've got 12000 miles on my 2004 Sti, im wondering can i just switch right away to synthetic motor oil? I've been using castrol gtx regular motor oil 5w 30. I'm planning on putting mobile1 synthetic motor oil. Do you guys think that they will mix right? Or if there are steps that i should take before i switch? Thanks any comments will be great.

Jim

Feb 5, 2004 | 06:44 AM

BlueSti389

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Nobody knows?

Feb 5, 2004 | 07:47 AM

dashiet

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its really a matter of opinion. everyone has their own theory, some has change theirs to synthetic at 1200 miles, then at 3400 miles, and so on. but i changed mines to synthetic at 2200 miles.

-dashiet

Feb 5, 2004 | 08:28 AM

my2003wrx

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From: Stuck At Work

You should be able to change it no problem. Some use some kind of product (can't remember the name) to flush the system before putting the new synthetic in. You can always do that to give you some peace of mind.

:banana:

Feb 5, 2004 | 10:12 AM

BlueSti389

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Wha kind of product is used to flush the motor? I've seen mobile 1 synthetic blend motor oil it says that it is like conventional oil but has synthetic blended into it. Can i use that just for 1 oil change? Or can i just put mobile full synthetic motor oil in?

Thanks

Feb 5, 2004 | 10:37 AM

DaWorstPlaya

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Synthetic should be fine ..... hell synthetic is actually better than regular for most high performance engines. I am surprised you didn't switch sooner. I been running only synthetic on my WRX after its break in period (3000 miles)

Feb 5, 2004 | 10:41 AM

my2003wrx

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You can search google to see what's out there in terms of motor flushing products. I did a quick search and saw that Amsoil has something and there's also something called Gunk Motor Flush. I suppose you could just let the old oil drain without using anything to flush the motor and just put in synthetic oil in. I wouldn't think that much or if any harm would come to your engine.

:banana:

Feb 5, 2004 | 12:29 PM

04blkWRX

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Car Info: Black WRX, stock

I've read that you can put some kerosene or diesel fuel through to clean all the old oil out but it seems like its unnecessary.

Feb 5, 2004 | 03:49 PM

Br1t1shguy

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you can change to synthetic whenever you want, modern syn's contain seal swellers which mean theres going to be no consequence if you change at 1000 miles or 100000

Feb 5, 2004 | 07:54 PM

#10

BlueSti389

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Thanks for the infos im just concern that the synthetic oil wont mix well with the left over conventional oil. I think im goin to try the amsoil flush and see what happens.

Thanks
Jim

Feb 6, 2004 | 05:49 AM

#11

04blkWRX

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There's no problem mixing. They sell oils that are mixed on purpose!

Feb 6, 2004 | 09:16 AM

#12

BlueSti389

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Thanks, does anyone know how is the product Amsoil synthetic motor oil are? Are they any good?

Feb 7, 2004 | 11:49 PM

#13

Ambros

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From: Toronto, On

Car Info: 2004 WRX STi / WR Blue

Quote:

Originally posted by BlueSti389
Thanks, does anyone know how is the product Amsoil synthetic motor oil are? Are they any good?

I've been using Amsoil for the past 2000km, and so far I've been really please with the results. I used Castrol Syntec 5w50 at first but the car seems to run smoother with Amsoil. I used a 5w30 grade but only cause its still cold right now.

I used to run Amsoil as well as Redline in my 00 A4 1.8t and I've had good results with both. I don't think you'd be disappointed with Amsoil though.

Feb 10, 2004 | 02:33 PM

#14

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Dahveed aka Robin Hood

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Go with Redline 10W40 full-synthetic.

I did it on my old '02 WRX, and will put it in my new STi when I hit 6k miles.

Engine spun more freely, ran great, no excessive consumption.

I've had nothing but luck with Redline oil & fluids in all my other cars, and I don't trust Mobile 1, Amsoil, Royal Purple, or anything else.

Feb 12, 2004 | 09:09 AM

#15

JeremyW

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Out of curiosity, why don't you trust the other brands such as Mobile1 or Amsoil? I've heard good things about them and was just wondering if you'd had bad experiences or if it's more of just and emotional marketing thing?