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1 Transmission Cocktail Mix

  • GrimmSpeed Subaru Transmission Cocktail Mix

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Product Description

FINALLY!!!....a place to get all the ingredients for the Transmission Cocktail! This cocktail is the famous tranmission oil mix that many many subaru owners have used to fix that bad shifting/grinding manual transmission.

No more searching around town trying to find all the ingredients and not being able to find them all...GrimmSpeed™ has them all in stock and ready to ship out to you.

If you'd like a smoother shifting gearbox, this is for you.

NOTE: This mix is only ideal for all 5 Speed Subaru Transmissions.


When filling up your transmission you will use ALL of Penzoil, Lightweight Shockproof, and 1 full bottle of the Castrol Hypoy C, then you use approx. 1/3 to 1/2 of the remaining Hypoy C until the transmission is full.

GrimmSpeed Uncle Scotty's Cocktail Subaru

Product Reviews

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Product Reviews

Showing reviews 1-10 of 21 | Next

  1. What a difference

    Posted by Alex T

    Just put this in my 2007 WRX and its like night and day. The shifting is so much smoother, and I no longer have that grind going from 3rd to 4th. I will just have to see how it does after some mileage.

  2. It's good

    Posted by wally

    This is great I can feel the difference in the lgt. Only flaw is that every forum states that its better to use the heavyweight over the lightweight maybe grimmspeed should clrify or change their products or make it an option to get the heavyweight other then that it's great

  3. Cocktail a bit off....

    Posted by JB

    This is a great cocktail but using the lightweight red line just isnt enough, it breaks down faster then I would have liked. Used the heavyweight redline and this lasted longer. Wish it came as an option for this.

  4. No more gravel

    Posted by Joel

    This cocktail is excellent. The gravely decelerating noise is virtually gone. Now it's pleasantly muted and I can drive with my windows down.
    Very pleased.

  5. Perfect products

    Posted by Gavin

    Highly-rated my tranny is so smooth!

  6. Good stuff here

    Posted by Unknown

    This didn't have as a dramatic effect on my car as others did, because I only had 51,xxx miles on my car anyhow. However, the trans was still notchy so I tried it out. It did noticeably make things smoother though. Still a bit notchy, but I think it was worth it. I'd do it again on any other Subaru I owned.

  7. Great change!

    Posted by Stephen

    I was hesitant to try this since it was a mixture of fluids but I'm glad I went with it. It has made shifts feel smooth and consistent. I have an 02 WRX and could never shift into first without rolling 2mph or less. Now I can get into first at about 15mph and it has also eliminated the little clip of a grind when shifting into fifth. I will use this again and would recommend it to people with the same problems. Thanks Grimmspeed!

  8. Shifting a lot smoother now

    Posted by Seth

    I used the cocktail on my 04 wrx wagon 180K miles. The grinding has gone away on cold shifts and the car definitely shifts smoother. I wouldn't say it shifts "like new" because I honestly never drove it when it was new. All in all I give this product 5 stars because not only does my car shift better than it did, but it costs about the same as 4 qts of the regular 75w 90 gear oil. Thanks again Grimmspeed! -Seth

  9. Uncle Scotty's Cocktail Never Fails

    Posted by Eric

    I have sworn by this mixture since my first Subie and have never had a problem. Always clean shifts and minimal resistance within the tranny

  10. Works Great, but needs revision

    Posted by Unknown

    I've had this fluid in my transmission for about 2 weeks on my 2002 WRX. I used the cocktail with one change, instead of the Redline Lightweight I used Redline Heavy Duty because Uncle Scotty recommended this as it will last longer. I can now shift down into 1st from 15 mph. I live in the North and it does get kind of thick on cold mornings but no worse than my previous fluid.

Showing reviews 1-10 of 21 | Next