Use the correct oil

89-94 DSM: The recommended oil for the rear axle of all the Mitsubishi DSMs GL-5 90w Hypoid gear oil.

Those who drag race should use Redline Shockproof Heavy.

If vehicle is being raced in climates that are 45* or warmer you may use a high quality GL-5 Hypoid gear oil that has an ISO of 280-460 because the heat load that is generated is sufficient enough to thin the oil out so it doesn't aerate, web, foam up or cause lubrication issues due to the oil being too thick to perform properly.

Friction modifier type additives are not necessary being that the DSM has a viscous coupling type limited slip.

OIL VISCOSITY INDEX CHART

96-07 EVO: Mitsubishi recommends that the rear axle that is found in the EVOLUTION be filled with the factory oil, Diaqueen LSD Gear Oil part#  3775610 or a high quality GL-5 or higher 90w Hypoid LSD gear oil. These oils contain a friction modifier that will reduce noise associated with friction disc type limited slips.

Those who drag race should use Redline Shockproof Heavy.

For road racing applications, use Redline 80w-140.  If you are wanting to increase the lock-up of the limited slip differential you will want to use Redline 80w-140 NS.  This oil will increase lock-up but it does not contain the friction modifiers that reduce noise.

If vehicle is being raced in climates that are 45* or warmer you may use a high quality GL-5 Hypoid gear oil that has an ISO of 280-460 because the heat load that is generated is sufficient enough to thin the oil out so it doesn't aerate, web, foam up or cause lubrication issues due to the oil being too thick to perform properly.

OIL VISCOSITY INDEX CHART

Do not use GL-3/4/5 gear oil in the rear axle

When it comes to the rear axle that is found in the Mitsubishi vehicles, do not make the fatal mistake of using any oil that is spec'd as a GL-3/4/5 gear oil. These one size fits all type oils are not recommended anymore than a one heat range fits all spark plug and they are notorious for ruining the ring & pinion gears.

Hypoid ring & pinion gears

The rear axle features hypoid gears, commonly referred to as ring & pinion gears. The word hypoid is short for hyperboloid which refers to the design of these gears. Hypoid gears don’t share a common axis, run quiet (for the most part) and they are very strong by design. Yet by this design, the gear teeth must slide across one another during their meshing and this is why you must use the correct gear oil with at least a GL-5 rating in the rear differential and transfer case. Use the wrong oil and the ring & pinion gears will be ruined almost immediately from the intense heat that is generated.

Filling the rear axle

Oil must be level with or slowly flow back out of fill/level plug.

EVOLUTION OWNERS TAKE NOTE: We recommend that the rear axle oil level be checked again after you have driven the car a few miles at speeds over 25mph to allow the oil to properly coat everything. Drive and recheck the oil level.

Change the transfer case oil every 5000 miles. Vehicles that are being road raced require race car maintenance and all drivetrain oils should be inspected after each race and preferably changed. Road racing applications may add an additional 1/2 pint of oil to the transfer case for added lubrication and cooling.  New or recently rebuilt transfer cases should have the oil changed after the initial first 500-1000 miles. New upgrades are available for the EVO rear differential. New or recently rebuilt rear axles should have the oil changed after the initial first 500-1000 miles.

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