A lube oil composition is disclosed which comprises poly(trimethylene-ethylene ether) glycol and at least one lube oil additive. The base stock can be optionally mixed with other base stocks. Preferably, the composition is used as hydraulic fluid, brake fluid, heat transfer fluid, compressor lubricant, textile and calender lubricant, metalworking fluid, refrigeration lubricant, two-cycle engine lubricant or crankcase lubricant.