Mobilegrease 28

Mobilgrease 28 – Synthetic Aviation and Multipurpose Grease (380 grams/13.4 oz)

Often used as a replacement for IsoFlex Topas NB52 when performing crank maintenance on SkiDoo Rev snowmobile engines. Topas NB52 uses a soap based thickener, Mobilgrease 28 uses a clay based thickener. Ideally these shouldn't be mixed together, if you're bearings still have the inner seal intact and have Isoflex in them still, then reusing Isoflex grease is the best option.

If the grease has been washed out due to an inner seal failure (extremely common), changing to a clay based grease can't potentially cause any issues as the original soap based grease has been washed out by the oil/fuel mixture. 

If running an engine with a known inner seal failure, greasing the bearing/s will be required on a somewhat regular basis, it all depends on how fast the grease gets washed out with the fuel/oil mixture. 

Mobilgrease 28 is a supreme-performance, wide-temperature range synthetic grease designed to provide outstanding protection under demanding operating conditions. It combines a polyalphaolefin (PAO) synthetic base fluid with a clay-based thickener, delivering excellent stability, wear protection, and resistance to extreme environments.

Key Features:

• Base Oil: Synthetic Polyalphaolefin (PAO)

• Thickener: Clay (non-soap)

• NLGI Grade: 1.5

• Color: Red

• Operating Temperature Range: -54°C to +177°C (-65°F to +350°F)

Performance Benefits:

• Wide operating temperature capability for both high-heat and arctic conditions

• Excellent resistance to oxidation and thermal degradation

• Provides strong protection against wear, rust, and corrosion

• Superior load-carrying capacity and long service life

• Resistant to water washout and chemical degradation

Typical Applications:

• Aircraft wheel bearings and landing gear components

• Industrial high-speed bearings operating under extreme conditions

• Automotive and heavy-duty equipment requiring high-performance synthetic grease

Mobilgrease 28 meets MIL-PRF-81322G specification and is widely used in aviation, aerospace, and critical industrial applications.