A reader asks: I have a Moser M9 built Camaro with a Wavetrac differential. Wavetrac specifies not to use gear oil containing friction modifiers. I can’t get the oil they recommend for a cost that makes sense. Does AMSOIL have a gear oil that will work for this diff?
Our answer: All of AMSOIL’s automotive gear oils have some friction modifier content. Based on what Wavetrac is saying, it might be wise to go with a different brand for this particular application.
AMSOIL’s synthetic gear oils such as Severe Gear and Long Life Series can certainly be used in most all original equipment differentials. They are designed for both limited-slip and non-limited-slip differentials. The exception is AMSOIL Severe Gear SAE 190 Racing Gear Oil. Friction modifiers are not needed as it is strictly a racing oil.
AMSOIL Synthetics Gear Oils can also be used in many aftermarket differentials with outstanding results. AMSOIL gear oils do contain ingredients to help provide seamless performance in clutch-type limited-slip differentials. Wavetrac’s differentials might be the only situation where this isn’t a benefit. Or at the least, a harmless addition. AMSOIL synthetic gear oils provide outstanding wear control and cooler operation in most any other differential design.
In the case of Wavetrac’s aftermarket differentials, they use helical-cut gears. Apparently, the Wavetrac design requires some friction between the gears in order to function correctly. Therefore, gear oils that have some friction modifier content might be too slippery for proper operation. It is important to note that “synthetic” gear oils are not the issue for Wavetrac. It is the addition of limited-slip additives.
To find the correct gear oil for your differential, see our application guide.
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