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Old 04-29-2013, 09:39 AM   #1
Tjlarsen
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Default Scotty's cocktail mix vs: valvoline full synthetic

I know this has probably been hit on the head a thousand times, but I've read so many opinions that it's hard to make a decision.

Which gear oil is best for my 02 wrx tranny: Scotty's Cocktail mix or Valvoline fully synthetic 75W-90? I've purchased the valvoline oil already, only because it was there at napa auto. Would it be worth it to take it back and get Scotty's? I've heard that the synchromesh is "acidic" and could deteriorate my synchros. Does anybody know if uncle Scotty's has any long term negative affects? Will valvoline help make shifting feel just as buttery as the cocktail mix? Any good citation of reputable sources would help out a ton.
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Old 04-29-2013, 10:12 AM   #2
vision.dynamix
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Scotty's cocktail is garbage.

Many have had good success with the Valvoline Synthetic 75w90. Some do find it too slippery and have success switching to Valvoline non-synthetic 75w90.

I ran the synthetic myself with great success before switching to Motul Gear300 75w90.
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Old 04-29-2013, 10:20 AM   #3
WRXSleeper
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Mobil Delvac 75w-90 is another option for full syn which is what I have been using for almost a year now. The Valvoline syn 75w-90 is too slippery, even just mixing a quart of that with regular Valvoline 75w-90 made a little crunch after a while on the 3 to 4 shift when shifting quickly.

I never tried the cocktail, didn't like the idea of mixing 3 different oils together.
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Old 04-29-2013, 10:21 AM   #4
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Valvoline is what the dealership stocks, I'll trust Subaru's engineering dept.
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Old 04-29-2013, 10:23 AM   #5
vision.dynamix
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Quote:
Originally Posted by sultan81 View Post
Valvoline is what the dealership stocks, I'll trust Subaru's engineering dept.
Dealership service departments don't always follow the manufacturers Engineering.

Subaru makes their own 75w90 gear oil called Extra-S.

Hell, some dealers are still putting the wrong motor oil in cars.
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Old 04-29-2013, 10:25 AM   #6
WRXSleeper
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Quote:
Originally Posted by sultan81 View Post
Valvoline is what the dealership stocks, I'll trust Subaru's engineering dept.
The same engineering dept that tells us to put 5w-30 in our turbo engines.
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Old 04-29-2013, 10:27 AM   #7
sultan81
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Quote:
Originally Posted by vision.dynamix View Post
Dealership service departments don't always follow the manufacturers Engineering.

Subaru makes their own 75w90 gear oil called Extra-S.

Hell, some dealers are still putting the wrong motor oil in cars.
Not all dealers carry Extra-S, thats what i use.
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Old 04-29-2013, 10:27 AM   #8
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FYI we have seen NOTHING but great success with Scotty's Cocktail. I can't even tell you how many success stories, emails, and phone calls we get regarding it.

Mike
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Old 04-29-2013, 10:29 AM   #9
unamused LGT
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Search NASIOC.

Then search bobtheoilguy

Then learn what GL ratings are

Then look for reviews of different fluids

Understand why you can actually use Red Line Shockproof in our trannys

decide for yourself and put it in.

(or if you're just too lazy to do all that, use what you bought.....it's fine)

LGT
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Old 04-29-2013, 10:52 AM   #10
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Valvoline....
But I'm running Amsoil 75w90.
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Old 04-29-2013, 11:34 AM   #11
Dakota D
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just wanted to stop by to say i have had tremendous success with the cocktail

100,000 miles on the 5speed
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Old 04-29-2013, 12:05 PM   #12
Tjlarsen
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These posts are all so helpful! Was that 100,000 miles using the cocktail, Dakota D?
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Old 04-29-2013, 12:26 PM   #13
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http://forums.nasioc.com/forums/show...php?p=13628938

There are a few famously known and used oil types for the Subaru transmission. With each choice there are people who love and hate them and people who think that XXX oil shot Kennedy as well. Choose one (don't overthink this now...) and if you like it, keep using it. If you don't, try another one.
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