Puff of white / blue smoke when letting off.
My 7.3l has 161k, and within the last 1k it has started releasing a puff of smoke when I let off the throttle. It's a small cloud and only smokes when you let off quickly.
The smoke only happens after the engine was under load, such as full throttle acceleration, or when towing a heavy load.
There is no smoke when driving normally or on start up.
I am confused because there is no smoke under-load, and it is a white/blue color, not quite like its burning oil and not clear white.
Searched around have not found answers so thanks for the help!