My Nissan frontier 2.5l 4Cyl 2014(less than 44,000 miles) runs strong but recently started giving me a lot of exhaust smoke (white) only at the first start if rest that long. Doesn't do it all the time, but when it happens, it is a lot. When this starts happening the car starts running rough as well. And oil consumption it is significant . I have replaced valves seals, but during the replacement I found oil inside the spark plugs well and I clean them all. After only a few days, started smoking again. The smoke doesn't seem to happen all the time though which has me puzzled. I can sit at a light one time and no smoke. The next time, I will leave a cloud. Have checked the coolant the level and color still good and I checked also the oil ans also it is good. I did test the check and test the PCV and it is good as well. I don't believe the issue is the EGR valve itself,... Any thoughts you have would be greatly appreciated. Assuming it isn't a major issue. Thanks a ton for your help.