Is AMSOIL gear lube compatible with RTV sealant?
AMSOIL automotive gear lubricants are compatible with RTV sealant. It is very important the RTV sealant manufacturer’s instructions be followed and the product be FULLY cured before contact with the gear lubricant.
Is AMSOIL gear lube compatible with conventional gear lubricants?
AMSOIL automotive gear lubricants are compatible with other synthetic and petroleum based gear lubricants. However, mixing AMSOIL gear oils with oils will shorten the life expectancy and reduce performance benefits.

AMSOIL Gear Lubricants

AMSOIL Severe Gear® 75W-90
AMSOIL Severe Gear® 75W-90
AMSOIL Severe Gear® 75W-110
AMSOIL Severe Gear® 75W-110
AMSOIL Severe Gear® 75W-140
AMSOIL Severe Gear® 75W-140
AMSOIL Severe Gear® SAE 190
AMSOIL Severe Gear® SAE 190
AMSOIL Severe Gear® SAE 250
AMSOIL Severe Gear® SAE 250
AMSOIL 75W-90 Long Life Synthetic Gear Lube
AMSOIL 75W-90 Long Life Synthetic Gear Lube
AMSOIL 80W-140 Long Life Synthetic Gear Lube
AMSOIL 80W-140 Long Life Synthetic Gear Lube
AMSOIL Synthetic 80W-90 Gear Lube
AMSOIL Synthetic 80W-90 Gear Lube
AMSOIL Synthetic Marine Gear Lube 75W-90
AMSOIL Synthetic Marine Gear Lube 75W-90
AMSOIL Slip Lock
AMSOIL Slip Lock
AMSOIL Synthetic Chaincase & Gear Oil
AMSOIL Synthetic Chaincase & Gear Oil
AMSOIL Marine Gear Lube Pump
AMSOIL Marine Gear Lube Pump
Will GL-2 through GL-5 gear lubes hurt synchronizers?
No. All gear oils AMSOIL recommends for manual transmission applications are perfectly safe for synchronizer materials.
Does AMSOIL Slip Lock need to be used with AMSOIL gear lubricants?
AMSOIL automotive gear lubricants have excellent frictional properties and generally will not need to be fortified with additives. If on rare occasions differential chatter occurs, AMSOIL Slip Lock is recommended.
Can different AMSOIL gear lubricant viscosities be mixed?
AMSOIL gear lubricants are compatible with one another. Mixing different AMSOIL gear lubricants, however, could change the viscosity properties of the oils, depending on the ratios and viscosities mixed. This could impact the drain interval. Mixing different viscosities of lubricants should be minimized whenever possible.
If a vehicle manufacturer recommends a 75W-90 gear lube, may a 75W-140 be used?
No. In most cases, 75W-140 gear lube is too thick to be used in place of 75W-90. For modified or non-stock differentials where a higher viscosity gear lube may be desired, AMSOIL typically recommends 75W-110. Contact AMSOIL Technical Services for specific recommendations at (715) 399-TECH (8324) or tech@amsoil.com.
Are AMSOIL gear lubes safe for yellow metals?
Yes. As long as temperatures don’t exceed 250°F (121°C), all AMSOIL automotive gear oils are safe to use in drive train applications with yellow metals. Check the AMSOIL on-line look-up guide at www.amsoil.com for specific questions.
Can AMSOIL Severe Gear® be used in Harley-Davidson transmissions?
Yes. In Evolution 1340 and all Twin Cam Harley-Davidsons, AMSOIL recommends AMSOIL 20W-50 Synthetic Motorcycle Oil (MCV) or Severe Gear 75W-110 Synthetic EP Gear Lube (SVT). In older Harleys, such as Knuckleheads, Panheads and Shovelheads, AMSOIL Synthetic SAE 60 Motorcycle Oil (MCS) or Severe Gear 75W-140 Synthetic EP Gear Lube (SVO) is recommended.
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