How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Jerry Newton Your Own Question
Jerry Newton
Jerry Newton, GMC Technician
Category: GM
Satisfied Customers: 4410
Experience:  ASE Master Technician, L1, Master GM Technician. Over 20 years of bumper to bumper GM experience.
Type Your GM Question Here...
Jerry Newton is online now
A new question is answered every 9 seconds

2006 4.8 L v8. not running bad, no sign of head leak. small

Customer Question

2006 4.8 L v8 . not running bad, no sign of head leak . small puff of white smoke on startup with antifreeze smell. uses 1 gal. a year.
Submitted: 7 months ago.
Category: GM
Expert:  Jerry Newton replied 7 months ago.

Almost certainly going to be a head gasket leak. They can be very tiny, and just like you've experienced, an unexplainable loss of coolant over time.

Head gasket failure isn't unheard of on these engines, and I've seen leaks like you describe go unrepaired for a long time. Just be advised that it may suddenly get much worse, but if you're otherwise OK with adding coolant occasionally, you can continue to drive it this way until it gets worse.