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I've had several cars with bad valve seals, and they would blow a light colored smoke out the tail pipe when started, after setting a while.
These are the seals on the valve stems, not the valve covers, so they let the oil seap down the valve stem into the combustion chamber, then upon starting, it burns off the oil that had leaked in over time, once that build up of oil burns off, it runs clean (this is to clarify, why valves seals will smoke out the Tailpipe).
I'm not saying that it couldn't be coolent, but if it had a bad head gasket, or a cracked head, it would get Worse when the motor gets hot....
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Huck
Subaru Ambassador
92 SVX LS-Tour Magnaflow Exhaust, 5-Spd-AWD 
88 XT6 AWD 5-Speed "Bride of FrankenWedge"
15 Impreza Premium Sedan
15 Crosstrek XV 5-Speed
My 5-Speed "How-To" Write-up
1976 Pontiac Firebird Formula
Current Count of Subaru's Owned.... "70"
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