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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 14 | Next

  1. 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

  2. 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

  3. 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.

  4. Works very well

    Posted by Unknown

    I was getting a notch or click shifting from 2nd to 3rd gear above 4k rpms on my 2011 WRX. The cocktail cured the issue and now the car shifts smoother than ever. I would highly recommend.

  5. I tend to support all GS products but...

    Posted by Dev

    I would like to start by saying I love all of GS products! I have almost everything they make and I'm hopelessly waiting on a cat back lineup! As for the transmission cocktail I have mixed thoughts. I started to get a small grind periodically going into second, used the gs trans cocktail and it seemed to go away immediately, yet after a day or two I started hearing odd noises from my trans. when I let out of gear or off the gas it was almost a grind. I drained the fluid out and it was chunky, not sure why? So as far as my review goes, the fluid I'm sure is fine for a trans that is relatively new or has minor issues, but for a 02-03 wrx maybe not. I'm not a scientist so please don't write it off on my review lots people use it and never have an issue! It's not a fix, just a band-aid for finicky or trans that have problem.

  6. Plesently Suprised

    Posted by Unknown

    I was never very happy with the shift feel of my WRX. After switching to this cocktail, there is a nice improvement.

  7. No more tough gears

    Posted by 2012wrx5speed

    I wish I had found this product 38,143 miles ago. The shifts are smoother, downshifting is crisper, and it feels just right. Do yourself a favor and even if your car does not need a transmission fluid change, do it, and put this in there. You will have zero regrets

  8. no more grinds

    Posted by Unknown

    I don't normally review products but this definitely deserves a review. My transmission would grind 1st when rushed into gear it would grind reverse when rushed and my 4th gear would grind sometimes. I've been using the cocktail now for over a week and have not grinded once! I highly reccommend this cocktail to anyone whose transmission grinds

  9. Check it out

    Posted by Unknown

    After a recent transmission fluid change by Exeter Subaru, I began having issues shifting into 5th gear. The dealer wanted to tear into the tranny to find the problem $$$$. After installing the Grimmspeed cocktail shifts are back to normal/smooth for less than 60 bucks.

  10. cocktail mix

    Posted by roshane campbell

    My car drives and shift 95% better than b4 i like this product and i will recommend it to everyone.

Showing reviews 1-10 of 14 | Next