Amsoil Severe Gear Diff Fluid

[Philth]

Has anybody tried it yet? I've read nothing but fantastic feedback regarding their 75W-90 Severe Gear fluid.

 

[427435]

Make sure it is API certified. A lot of their products aren't.

I would recommend that you use a synthetic oil of the recommended viscosity from a major oil producer (Mobil, Shell, etc).

 

[Potty_Pants]

I know my response is negative and doesnt answer the question.

Why mess with the stock setup. 100k warranty, doubt any noticible gains from oil change.

Ppp

 

[EXBMWGUY]

I believe Amzoil products are, for the most part, quite good, as long as you know exactly which products you should be buying for your particular application. Not everything they sell may be correct.

However, we all know that cultists operate my using tactics that are designed for control of others' minds (Amzoil executive and marketing team, as well as independent distributors). They would have you believe the margin of performance gain with Amzoil products is greater than Mt. Everest is high, when in fact it's probably more like a mole hill.

 

[Rudderman98]

Has anybody tried it yet? I've read nothing but fantastic feedback regarding their 75W-90 Severe Gear fluid.

I have it in my 1997 K1500 GMC Suburban and have 150,000 trouble free miles on the differential and related components. Also used it in my old 1985 Suzuki Samurai which never gave me issues either regarding the diffs.

I would have to agree with Potty Pants on why would you want to change the oil on a vehicle with a 100,000 mile warranty? I use Amsoil products but do not use it in my Genny because of the warranty. I have my fluids changed at the dealer to cover myself if a warranty issue should arise.

 

[CarLightTrends]

From my personal use of AMSOIL back in the day when I used to race JetSkis I would premix and I swore by AMSOIL, now my engines would be tore down every three races and this was done for two seasons as a privateer with no sponsorship hence why I only raced for two seasons. Now for a warrantied car I wouldn't even change it out, there is a very good chance that you will not have your genesis past its original warranty.

 

[Philth]

Make sure it is API certified. A lot of their products aren't.

I would recommend that you use a synthetic oil of the recommended viscosity from a major oil producer (Mobil, Shell, etc).

API certified for a gear oil?

 

[Mark_888]

There is no measureable difference between synthetic quality gear oils for an automobile differential. In fact, most cars can go the life of the car without changing it if it is a synthetic (although it is good to follow manufacturer recommendation). There is simply no comparison of the kind of demands put on an engine oil vs. what happens inside a gear differential. I would bet every dime I have that no one could consistently tell the difference between Amsoil gear oil and a major brand like Mobil 1 gear oil in a blind test for a Genesis.

The main problem with gear differential oil is if it becomes contaminated somehow with moisture, such is driving a flooded street, etc. Maybe there is some exposure in the Genesis when driven repeatedly in heavy rain also (I don't know). But if the gear oil is exposed to water, then it needs to be changed regardless of what kind or brand it is. So bottom line, there is no need for high priced exotic brands for rear differential gear oil (any name brand synthetic will perform equally well).

 

[427435]

API certified for a gear oil?

Yup.

API ratings

Gear oils are classified by the American Petroleum Institute using GL ratings. For example, most modern gearboxes require a GL-4 oil, and separate differentials (where fitted) require a GL-5 oil. It is important that purchasers check the oil against the vehicle manufacturer's specification to ensure it does not contain any aggressive chemicals that may attack yellow metal gear components, such as phosphor bronze.

API viscosity ratings for gear oils are not directly comparable with those for motor oil, and they are thinner than the figures suggest. For example, many modern gearboxes use a 75W90 gear oil, which is actually of equivalent viscosity to a 10W40 motor oil. Multigrade gear oils are becoming more common; while gear oil does not reach the temperatures of motor oil, it does warm up appreciably as the car is driven, due mostly to shear friction (with a small amount of heat conduction through the bellhousing from the engine block).

Fully synthetic gear oils are also used in many vehicles, and have a greater resistance to shear breakdown than mineral oils.

API classification subdivides all transmission oils into 6 classes:

API GL-1. Oils for light conditions. They consist of base oils without additives. Sometimes they contain small amounts of antioxidizing additives, corrosion inhibitors, depressants and antifoam additives. API GL-1 oils contain no EP addives, are designed for spiral-bevel, worm gears and manual transmissions with synchronizers, in trucks and farming machines.
API GL-2. Oils for moderate conditions. They contain anti-wear additives and are designed for worm gears. Recommended for proper lubrication of tractor and farming machine transmissions.
API GL-3. Oils for moderate conditions. Contain up to 2.7% anti-wear additives. Designed for lubricating bevel and other gears of truck transmissions. Not recommended for hypoid gears.
API GL-4. Oils for various conditions - light to heavy. They contain up to 4.0% effective anti-scuffing additives. Designed for bevel and hypoid gears which have small displacement of axes, the gearboxes of trucks, and axle units. These oils are standard for synchronized gearboxes, especially in Europe, and may also be recommended for non-synchronized gearboxes of US trucks, tractors and buses and for main and other gears of all vehicles. GL-4 oils may also be used in many limited-slip differentials.
API GL-5. Oils for severe conditions. They contain up to 6.5% effective anti-scuffing additives. The general application of oils in this class are for hypoid gears having significant displacement of axes, generally non limited-slip differentials. They are recommended as universal oils to all other units of mechanical transmission (except synchronized gearboxes specifying GL-4). Some GL-5 oils in this class, which have special approval of vehicle manufacturers, can be used in synchronized manual gearboxes. API GL-5 oils can be used in limited slip differentials only if they correspond to the requirements of specification MIL-L-2105D or ZF TE-ML-05. In this case the designation of class will be another, for example API GL-5+ or API GL-5 LS.
API GL-6 is not applied any more as it is considered that class API GL-5 well enough meets the most severe requirements. When API GL-6 was still in use, it denoted oils for very heavy conditions (high speeds of sliding and significant shock loadings). They contained up to 10% high performance anti-scuffing additives. They were designed for hypoid gears with significant displacement of axes. However, in 2011 at least one company offers new polyol ester based API GL-6 oil, mostly for racing applications. The application is limited to certain types of manual transmissions, but improvements in BSFC of about 5% in standard weather and driving conditions and up to 15-20% in cold extremes (arctic weather conditions) can be expected.


http://en.wikipedia.org/wiki/Gear_oil

 

[Billfz1]

Some years ago building race cars and motorcycles we did some dyno tests and found Redline synthetic out performed everything we tested in the manual transmission and differential. This was testing against conventional oils. Any of the other synthetic oils gear oil or engine should be very close. Redline is one of the most expensive oils out there and I probably wouldn't have used it over mobil1 if we hadn't had sponsorship! There are lots of good synthetics these days. Any major brand will probably be so close you can't tell the difference.
Bill

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