Lubricant mixtures are created when different oils or greases are combined – either intentionally (conversion) or unintentionally (refilling, maintenance). Risks: Incompatibility of base oils (mineral, PAO, ester), thickeners in greases (e.g. lithium, calcium, polyurea) and additives. The consequences can include: change in consistency, oil separation, foaming, loss of corrosion protection, seal swelling or deposits.
The basic rules are: avoid mixing, obtain approvals, empty when changing, rinse, refill completely. If you are unsure, mixing tests and material tests can help. Colour codes, clear labelling and separate tools prevent mix-ups. Documented media lists and training ensure long-term process stability, availability and quality.
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