Red Line 58404 Lightweight Shockproof Gear Oil - 1 Quart Bottle

Would recommend this to anyone with an STI doesn’t matter the year, this stuff plus some redline 75w-90 gear oil is what helps your transmission in the long run, always better to be safe than sorry.

don't worry about the thin appearance of this oil, i launch @4200 rpm with a big tire car and so far so good, also it was the 1st time i have been in the 3.8XXX at the 330' cone and finally did it. so far so good

good packaging, good product cheapest i could find

used in my 2015 VW TDI, 80k mile transmission oil change. shifter feels and works great.

I have a 2019 Edge ST with 32k miles. Ever since I bought it, it's had a shudder on tight turns that seemed to be coming from the rear diff. I got some of this and drained and filled with it and my shudder noise is gone. The blue color is nice too. Quality product that I would highly recommend.

Cheapest I could find the shockproof and quick shipping.

I bought this after my old nissan D21 started grinding while shifting into second. Reading through numerous forums, the general consensus was that MT90 is great and can smooth out shifting, but will not fix any grinding issues. Shockproof, on the other hand, can in some situations alleviate a grinding issue. Initially I was concerned about using shockproof because it contained sulfides and my transmission has brass syncros, but one of the engineers at red line explained that shockproof has a copper neutralizer that would prevent it from eating yellow metals. He was adamant that shockproof was not meant for syncro transmissions, but I decided to try it out since my truck was hard to drive as it was. So far after three months it is still going strong. I cannot do high rpm downshifts, but under normal driving conditions it works great.

The subject is my 184,000 mile car with a Getrag 260 transmission which seemed to start showing its age lately. When taking off in first and then into second gear, you could hear a clakety-clack sound when the car was not fully warmed up. The sound was more noticeable after the clutch was replaced and I thought that soon I would either need to get a new transmission or replace the car. At a stop sign, in neutral, while waiting for the light to change, you could hear strange noises coming from the gear box. They would go away when you depressed the clutch pedal. I decided to give this gear oil a chance. The results were immediate: all the gear noises are gone, shifts are glass smooth. Performance with a cold or warm transmission are excellent. No teeth grinding when shifting. It just feels like a brand new car. :) Hats off to the engineers at RedLine lubricants.

I don't leave reviews at all but after using this product, I knew I had to leave a review. Got recommended by my tutor and read reviews about this product before purchasing, but was extremely surprised to confirm that it's legit. I drive a Mazda 3 (2015, BM). My Syncro's are quite worn and was having trouble shifting from 1st to 2nd and recently getting trouble shifting to 3rd, my 2nd gear cluster bearing was also noisy whilst cruising in 2nd, this is with replacing the transmission oil with Mazda's OEM transmission oil. After replacing the oil with this, it's truly a night and day difference. Feels like a new car, shifting is silky smooth and the cluster bearing is not noisy anymore! It does not completely solve the worn Syncro's but it's 200% better than what it was before. Highly recommend and would be buy again.

When added to the transmission of a manual 5spd 2017 Subaru impreza it quieted down a noisy synchro that had presented noise for years, reduction noted appx 99% but ideally time will tell. Thank you redline

Brilliant product

Good stuff...

I used one bottle of this mixed with 3 bottles of redline 75W90 gear oil in my subaru 6-speed for my transmission. It works amazing, the gears shift like butter now due to the lightweight shockproof oil acting more like a liquid grease. I have seen people with a tranny that grind into gear use this gear oil and it will stop it from grinding completely. You have to change it more often if you run it straight but I mix it to give it a longer lifespan.