An overbased calcium magnesium sulfonate grease composition and method of manufacture comprising both overbased calcium sulfonate and overbased magnesium sulfonate in a ratio range of 60:40 to 100:1. The grease is made according to any known method for making an overbased calcium sulfonate grease by using the overbased magnesium sulfonate in addition to the overbased calcium sulfonate. A portion of the magnesium sulfonate may be added prior to conversion and another portion after conversion, with or without one or more delay periods between the addition of water or other reactive ingredient and the addition of magnesium sulfonate. The grease can be made using calcium hydroxyapatite and/or added calcium carbonate as calcium containing bases for reacting with complexing acids, a non-aqueous converting agent delay method, added alkali metal hydroxide, or any combination thereof. The grease has a high dropping point and reduced thickener yield.

An overbased calcium magnesium sulfonate grease composition and method of manufacture comprising both overbased calcium sulfonate and overbased magnesium sulfonate in a ratio range of 60:40 to 100:1. The grease is made according to any known method for making an overbased calcium sulfonate grease by using the overbased magnesium sulfonate in addition to the overbased calcium sulfonate. A portion of the magnesium sulfonate may be added prior to conversion and another portion after conversion, with or without one or more delay periods between the addition of water or other reactive ingredient and the addition of magnesium sulfonate. The grease can be made using calcium hydroxyapatite and/or added calcium carbonate as calcium containing bases for reacting with complexing acids, a non-aqueous converting agent delay method, added alkali metal hydroxide, or any combination thereof. The grease has a high dropping point and reduced thickener yield.

The present invention relates to lubricating grease compositions comprising (a) at least one high-viscosity fluorinated oil having a viscosity of 500 to 1500 mm.sup.2/s, (b) boron nitride and (c) a binder selected from bentonite, alkali metal phosphates, aluminum phosphates, alkali metal silicates, alkaline earth metal silicates, aluminum silicates, alkaline earth metal carbonates, calcium borate, silicon dioxide, titanium dioxide, aluminum oxide and mixtures thereof. The lubricating grease compositions find use especially in the high-temperature sector, for example for the lubrication of oven pullout rails.

A constant velocity joint having a boot constructed from a thermoplastic polyether ester as the boot material. The boot includes a lubricating grease composition for lubricating the constant velocity joint, the lubricating grease composition comprising calcium lignin sulfonate.

A constant velocity joint having a boot constructed from a thermoplastic polyether ester as the boot material. The boot includes a lubricating grease composition for lubricating the constant velocity joint, the lubricating grease composition comprising calcium lignin sulfonate.