So I took my ZJ for its annual inspection, and it failed. The printout says it was blowing "white smoke". This surprised me; I know it's burning oil on idle and I still haven't got round to changing the valve stem seals, but to me, white smoke means that you're burning coolant, and as far as I can tell I'm not.
I completely overhauled the cooling system in the last year - new water pump, rad, hoses, T-stat housing and fan clutch, plus new freeze plugs after one started leaking. I check my coolant level at least once a week, and it never drops. So what's with the white smoke?
I had a look just now, and sure enough the smoke looks white, or maybe *very* light blue, but it certainly doesn't smell sweet - it's a full-on oil-burning smell.
Could a "stop smoke" oil additive cause white smoke as it got burned? I got persuaded into having one added last time I got my oil changed.