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
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?