Royal Purple 01300 Max Gear 75W-90 High Performance Synthetic Automotive Gear Oil , 1 Quart (32 Ounces)

Used in my 2013 Ford escape 2.0 differential no issues. Original oil has about 160k on it and was black and thickThis seems.to work great no issues at all.When I bought it a year ago it was a Lil cheaper back then.

I put this in my 1973 Ford F250 rear diff when I redid the rear end, greased the bearings, and replaced the seals for the back axles. Same product, same oil weight. That was six years ago. (This truck shares the diff fluid with the axles and wheel bearings). Recently, I noticed that my brakes were leaking brake fluid on one of those wheels, so I needed to take the axle apart again. I was shocked to discover that a micro crack in one of the old bearings I had not previously seen upon assembly had caused much of the bearing to come apart completely. Metal chunks and shavings everywhere. There was no noise, no nothing, while driving. And amazingly, no damage to be found on the bearing journals or to the gears or anything else. Who knows for how many years it was driven that way, and this stuff protected it perfectly. Not so much as a single scratch/scoring on anything. Even the rest of the ancient, 50 year old bearing, was fine polished with no damage. I don't think I'll use anything else in my gearboxes from here on out.

Exactly what was promoted.

Purchased for the front and rear diff in my Durango SRT. I had a "clunking/jerking" feeling if you would accelerate hard and after reading many reviews, the diff fluid needed to be changed. I was at 50k miles and was supposed to be done at 40 so I figured this would fix it. It sure did. It has the additive in it already and I will say putting this fluid in my Durango made it happy. It was a way better price then the Mopar brand of fluid and works just as well. I did purchase a pump to get the fluid into my rear diff. The front was easy to fill. Royal Purple has always been a great brand and still doesn't disappoint.

Although It(Royal Purple) isn't rated for use in either transmission. I've used Royal Purple's Synthetic gear lube in both of my 6-speed Evolution Big Twins. I've been running Royal Purple in the '88 Road King clone since building it some 35 plus years ago. The synthetic lube has given me good service through the years,. I ride year round and the transmission shifts just as easily cold as it does warmed up. The '92 Softail Springer is both a new addition and a "work in progress. After the six speed modification the bike was slow and somewhat difficult to shift until it got warmed up. After changing out the original gear lube for Royal Purple it shifts easily cold or hot.

I used this stuff to replace the transfer case and differential oil in my 1999 Toyota Land Cruiser, which has a monster V8 engine and previously recorded a best fuel economy of 14 mpg highway. I checked fuel economy carefully over many trips on the highway, always driving conservatively at the speed limit, 65 mph in NY. So I'm very confident in the 14 mpg and that's best case driving. Town and stop-and-go driving was lower. Also the 14 mpg was measured after a recent engine oil and filter change with Mobil 1 Synthetic. Anyway, I'm pretty sure the transfer and diff oil was never changed by the previous owner, based on the condition of the drain screws and the fact that something resembling black pudding sludge dripped out during the draining process. The transfer case took about 4 quarts and the diff about 5 quarts. I "wasted" about one full quart during the oil change trying to flush out the gears by continuing to pump in more fluid during even after it started leaking from the upper fill hole. This did seem to cause a few squirts of additional sludge to come out through the drain. After the change I immediately noticed that the vehicle seemed a little quieter and smoother, it was a barely perceptible change but I'm pretty in tune with the noises this LC makes, and noticed a definite lower sound from the drive train, in fact it was very quiet overall. The big surprise was the gas economy, though. Halfway through the trip, which is about 100 miles and route I drive fairly regularly, I knew the gas mileage was better than before. Upon returning home and hitting the first gas station off the highway, I was amazed to find that my fuel economy went from 14 mpg to 17.42 mpg, an unbelievable 24% improvement. Nothing else changed with the vehicle, same driving style, same gas, etc. The only variable that changed was the use of Royal Purple. Assuming this continues, my fuel range is increased from approx. 280 mi/tank to about 348 mi/tank. This equates to a savings of roughly $15.50 per tank, or for city driving probably around $10/tank. So the whole load of oil will pay for itself fairly quickly. My cost per mile dropped from $0.30 to $0.23. I'm very impressed with this oil, so far it is one of the best things I have done for this vehicle. I will use it in my other car for sure. Expensive but definitely worth the price.

Safe for brass

I used this in a vehicle that called for 90 weight. This is 80 - 90, but I live in a climate with sub zero winter temperatures, so this weight is actually perfect, if not preferred. My mechanic put this iny 12 year old Toyota's transfer case and rear differential, along with Prolong engine and transmission additives, and couldn't believe how quietly and beautifully it drove. He said it felt and sounded like a brand new car, despite having over two hundred thousand miles on it.