Lubricating oil compositions containing a halide seal compatibility additive and a second seal compatibility additive

A lubricant composition that provides improved compatibility with fluoropolymer seals, said lubricant composition comprising:

• a base oil;
• an iodide seal compatibility additive comprising at least one iodine atom;
• and
• a second seal compatibility additive, different from said iodide seal compatibility additive,
• wherein a weight of said second seal compatibility additive in said lubricant composition is greater than or equal to a weight of said iodide seal compatibility additive in said additive lubricant composition,
• wherein said iodide seal compatibility additive comprises:
• (1) an acyclic hydrocarbon backbone comprising at least one carbon atom, and wherein said at least one iodine atom is bonded to said at least one carbon atom in said acyclic hydrocarbon backbone and wherein said acyclic hydrocarbon backbone includes at least one hydroxyl group;
• or
• (2) an alkyl iodide compound having a general formula:
• CnH(2n+2−m)Im
• where n≥1, and 1≤m≤(2n+2).

A method of lubricating a system comprising a fluoropolymer seal, said method comprising:

• providing a lubricant composition that comprises a base oil, an iodide seal compatibility additive comprising at least one iodine atom, and a second seal compatibility additive, different from the iodide seal compatibility additive, wherein the weight of the second seal compatibility additive in the additive package is greater than or equal to the weight of the iodide seal compatibility additive in the lubricant composition,
• wherein said iodide seal compatibility additive comprises:
• (1) an acyclic hydrocarbon backbone comprising at least one carbon atom, and wherein said at least one iodine atom is bonded to said at least one carbon atom in said acyclic hydrocarbon backbone and wherein said acyclic hydrocarbon backbone includes at least one hydroxyl group;
• or
• (2) an alkyl iodide compound having a general formula:
• CnH(2n+2−m)Im
• where n≥1, and 1≤m≤(2n+2);
• and
• contacting the fluoropolymer seal with the lubricant composition.