







⚙️ Gear up with the shockproof edge that pros trust!
Red Line's 58204 Heavy ShockProof Gear Oil is a fully-synthetic 75W90 lubricant crafted from polyol ester base stocks, delivering exceptional protection and efficiency for high-performance differentials. Ideal for racing and specialty applications, it exceeds API GL-5 standards and extends drain intervals, making it the go-to choice for professionals demanding peak gear performance.






| Manufacturer | Red Line |
| Brand | Red Line |
| Model | Redline |
| Product Dimensions | 22.86 x 9.88 x 9.83 cm; 771.11 g |
| Item model number | 58204 |
| Exterior | Painted |
| Manufacturer Part Number | 58204 |
| OEM Part Number | 58204 |
| Item Weight | 771 g |
| Viscosity | 75W90 |
N**C
Questo olio per differenziale è veramente fantastico e mantiene ciò che promette. E' bene ricordare che è un olio per differenziale e non va usato nei cambi con sincronizzatori. Leggere le indicazioni di utilizzo e la scheda tecnica, sono chiare e ben fatte.
3**0
My 3rd gear synchro was failing and grabbing and gridning getting in to gear, after a bit of reading I decided to try this and it fixed my gearbox and saved me $1000s.
T**Y
Used this in my 1999 Subaru Impreza Outback Sport with noisy front and rear differentials. I threw some mobil0-1 75w-90 in each diff for about 1k miles to rinse things out. Just dropping the beat-up, dark diff fluid and going to Mobil 1 was a marked improvement alone. After running that sacrificial fluid for 1k miles, I drained it (and it was in much better shape, but still appeared QUITE DIRTY) and installed some Lucas full synthetic 75w-90 gear oil with about a half of the Heavy Shockproof quart going into the front and a half going into the rear diff. I put the Redline in first so it would mix better. Both my front and rear differentials are OPEN (not LSD; if you have an LSD, DO NOT USE this redline shockproof series). Immediately, I noticed that the diffs were notably quieter and that the car even accelerated and coasted more easily than even with the mobil-1 gear oil. I used the heavy shockproof because I'm in Florida and it never gets very cold here (it dips below freezing for a few hours, a few nights of the year, but only just below). If you are not in a southern state (FL, Texas, AZ, NM, LA, etc), I would advise selecting the lightweight shockproof instead. Overall, I'm extremely satisfied. If you have an open diff, or an air locker (anything but an LSD), you owe it to yourself to add a portion of shockproof to your diff. Quieter means cooler. That's always a good thing. Also, NEVER add this to any transmission. Even a manual. Your synchros will be permanently too slippery to work properly.
P**L
The best lube for Harley-Davidson Transmissions , quiets shift & makes finding neutral effortless!
R**!
It is awesome... buy some today. I put this in my Baker 6 speed on my custom V Twin... So far so good....
Trustpilot
5 days ago
3 weeks ago