I've got a 99.5 V6 A4 Quattro. 100k miles, timing chain and water pump changed at 80k. Oil recently changed by a new shop--good rep, but unknown competence to me.
I've got to drive 400 miles tommorow and just today discovered that the coolant level in the tank is quite low, perhaps 1.5 inches below the minimum mark with engine cold. Normal temp readings, no warnings during running.
I thought I had been smelling coolant on occasion but put it off stupidly till finally noticing the low level today. Must be a leak, but can I get away with topping off with Prestone Extended life or Havoline Dex-cool or whatever to get through this trip, then have my shop fully address the prob upon return? Should I dilute 50/50 with water for that small top off quantity? Dave