'08 WRX sedan, 27k, mobile 1 5w30, 90 octane fuel + STP octane booster. Perrin downpipe and catback exhaust. Cobb tuner currently running in ECO mode.
I was driving home from town at about 65 mph/2800 RPM. Car started smoking, like 007 smokescreen smoking, pulled into the drive smells like burning. There is oil residue on the rear bumper and smoke coming from the union of the turbo and down pipe. There is plenty of oil on the stick, changed it roughly 500 miles back. The current temperature is -18 F. In the past extreme cold has caused the car to run rich, but not smoke. Any ideas as to what is causing this, B/C I really don't want to replace a turbo right now.
Thanks in advance for your advice.