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Old 07-23-2006, 09:45 PM   #1
Alan l.
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Member#: 90085
Join Date: Jun 2005
Vehicle:
2009

Default Redline, Royal Purple or Castrol 4eat oil??

Yes i know what the manual says to use but what do most people here with the 4eat use with proven results? Seems like i've read just as much postive reviews as I have negative with going Redline or royalpurple synthetic oils on the auto tranny. I suspect that most of the negative reviews/problems were due to issues that existed on the tranny already but became more noticable when they flushed the system.

I want the best fluid for my 4eat for longevity and smooth shifts but i'm not sure what to run.

Whats tried and tested to simply work on these trannys?? I came from the bmw world and Redline was pretty much THE oil thats proven to do wonders for their transmissions.

Redline?

Royal Purple syncromesh?

Regular castrol?

Another brand?

Also, how many quarts usually drains out of the pan? Is there any cons to using an oil extractor from the transmission dip stick to suck out the oil as opposed to getting under the car draining it the old fashion way?

BTW, I have about 12K miles on my stage 2 4eat.

Thanks!
Alan
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Old 07-23-2006, 10:44 PM   #2
stitrueblue
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Location: Woodstock , GA
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04 STI

Default

my guess is your gonna get opinions all over the place on this one (at least thats what my research has shown), but here is my 2 cents.

about 4 weeks ago i switched out the oem tranny oil for royal purple. todate, the shifts are smoother with no side affects. overall - very pleased.

i went with royal purple for a couple of reasons 1) they are a supporter in subiesport and i like the mag 2) i've tried just about every other syn oil out but not royal purple 3) at 1k miles i switched in mobil 1 into the engine, at 5k i switched to royal purple (reasons 1 & 2), having consistantly averaged around 18.5 mpg per tank (i check every fill up), my mileage jumped to just over 20 mpg and has never dropped below that ( i basically just drive it back and forth to work so the route is very consistant).

even more controversial is the rear diff, i almost certain (not 100% yet) that at my next oil chg royal purple is going back there too (man i know i'm gonna get it for that one)
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Old 07-23-2006, 10:56 PM   #3
Alan l.
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Default

^^ Thanks for the info.

This is the type of responses that i'm looking for. I too ran RP on my sc'ed bmw as well as redline and both worked wonders on the 5spd. Butter smooth shifts.

I'm new to the suby scene so i'm not sure how this stuff works with it. I've read posts where people love going synthetic in their 4eats as well as posts where they claimed the transmission slipped like hell after the change causing catastrophic failure.

Alan
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Old 07-24-2006, 01:05 AM   #4
wrxdrvr
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'09 STi 297.5 WHP
Blue

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I personaly think any synthetic trany fluid will be better or as good as stock. I use AmsOil and think it's great. Changed to AmsOil rear diff too and it's also seems better than with the stock oils.
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Old 07-24-2006, 01:25 AM   #5
Alan l.
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Did you notice any difference when you switched?
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Old 07-24-2006, 10:05 AM   #6
kheff46
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silver

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i use amsoil high pressure in my rear diff. and royal purple in my 5spd. feels better than the mystery stuff in it before(thick red stuff). no problems with grinding, slipping etc., but it's not an auto either.

--keith
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Old 07-24-2006, 10:15 AM   #7
LyveWRX
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& Red Ford & '72 CB350

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I'll bet the thick red stuff was Redline heavyWt Shock proof...

But I dont know why you would put gear oil in an automatic transmission.
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Old 07-24-2006, 11:37 AM   #8
wrxdrvr
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'09 STi 297.5 WHP
Blue

Default

Quote:
Originally Posted by Alan l.
Did you notice any difference when you switched?
Yes I did, espessialy when it got cold... My car rolls out of my driveway all the way to the end now instead of just 1/2 way like it used to with the stock oils in the diffs.
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Old 07-25-2006, 05:28 PM   #9
Alan l.
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bump for more info...
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Old 07-25-2006, 05:31 PM   #10
distorto
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Location: houston, texas
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RIP stompr :(
bagged vulvva

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i am using the new subaru syn and haven't had any problems with it.
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