Loading... Please wait...

- Shop By Car -

Product Finder

Shop By Make

- Shop By Product Line -

1 Transmission Cocktail Mix

  • GrimmSpeed Subaru Transmission Cocktail Mix

Have questions about fitment or applications? Contact Us

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

Write your own product review

Product Reviews

Showing reviews 1-10 of 18 | Next

  1. 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.

  2. Perfect products

    Posted by Gavin

    Highly-rated my tranny is so smooth!

  3. 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.

  4. 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!

  5. 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

  6. 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

  7. 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.

  8. 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.

  9. 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.

  10. 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.

Showing reviews 1-10 of 18 | Next