I had the same issue and the dealer found a leak on the connections to the turbo (both supply and return). They replaced the fittings and it has been good ever since. I had the smell in the cab when the turbo was at full boost for an extended period of time.
I had my 24 TRD OR at the dealer getting the 1 year service completed last week. Along with the service, which is what my appointment was for, they also did the brake recall and the trailer blind spot sensor recalibration TSB. Total time in the shop was ~3.5 hours.
I am 8 months into my ownership, ~7K miles and no problems.
I have added
- Tinted front door windows
- tonneau cover
- front LED turn signals (complaint)
Additional complaints
- gap in front wheel liner. Lots of dirt into the engine compartment. (Plan to fix after snow)
- mud flaps are...