Slick 50 60199080 Manual Gearbox Treatment, 80 ml

I have used various oil additives in all my cars over the last 37 years, and I think Slick50 is effective, safe and although it seems quite expensive I only use it every 30,000 miles when I change my gearbox oil, so it's not so bad. Be carefull when choosing your gearbox oil with reguard to GL4 / GL5. The GL5 grade uses different chemicals in it and may lead to bronze bearing deterioration & failier if incorrectly used. The GL4 specification seems to safer if yore not sure. Always check with the hand book / internet / ask for advice if you can before replacing the oil.

I put this in an astra j 2.0 at the same time as doing an oil change it did seem to make a difference much smoother gear changes.

I have been using this in VW boxes for decades, it transforms a gearbox, especially when used with Red Line MTL or MT90 depending on application.

Synchromesh problem shove this stuff in. Takes a week or so to work fully

I have use this product before, and had on problems , so I am hoping for the same result.

Makes the car run better

at time of writing have just added it to gearbox after oil change. fast delivery and hoping for great things from this stuff

Always liked Slick-50 engine treatment. This however is Mad packaging for a small container - pre-packed measurers = more plastic waste to "dispose" of.