I can always tell when I popped a valve stem seal. When driving I had no smoke at all. Came to a light and idled for a minute and poof, nice puff of oil comes out the back. It also happens when I take the off ramp when I come home from work and then a mile sitting at a light. Almost seems that with the body roll the oil will seep down in the stem hole.
On my seals they are ONLY the exhaust seals. All of my intakes have been fine since replacing them a few years ago.
Take off the valve covers and grab your phone. Start taking pictures and you can see which one popped off.
Notice the picture below. The left is the exhaust seal that came off the last time I dorked with my car. The right is the intake and is seated down correctly.
