I was just sitting in a parking lot waiting for some ppl and i looked back and saw some blue smoke from the tailpipe...i revved it up and she cleared up for a minute but it still concerns me....i was sitting for about 15 minutes!

 

Is this new? Mileage? Has you done a compression and leakdown? Have you noticed any oil loss between changes?

 

No i havent had any oil loss and it has 98k....it doesnt smoke at all during any part of the rpm range! I just noticed it sitting in the parking lot after 15 min

 

Almost positive its leaky valve seals/guides. Basically while your sitting there idling the motor is pumping oil up to the head and it is pooling behind the valve and slowly leaking through and getting burned off. However while under load there is negative crank case pressure which helps draw the oil through the passages in the head back down to the pan and its not having time to pool up behind the valve.