1. Mixing different base oils
- When mineral-based and synthetic-based greases are mixed, chemical incompatibility occurs.
- Result: Grease hardens, its fluidity deteriorates, and its lubricating effect on the bearing surface is lost.
2. Incompatible thickeners
- When lithium, lithium complex, aluminum or calcium-based thickeners are mixed:
- Grease separates or clumps
- No uniform film forms within the bearing
- Result: Friction increases, wear accelerates.
3. Wrong viscosity or NLGI
- Too viscous grease → increased heating and friction at high speeds
- Too thin grease → cannot provide adequate lubrication under heavy loads
- Wrong NLGI → grease overflows within the bearing or becomes ineffective
4. Additive incompatibility
- If EP, AW, antioxidant, and other additives are incompatible with each other:
- Grease chemically degrades
- Bearing surface is unprotected, corrosion and wear accelerate
5. Practical consequences
- Overheating and friction
- Premature wear, pitting, and cracks in bearing elements
- Decrease in energy efficiency
- Significantly shortened bearing life
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