I used to drive several brands of semi & 10 wheel trucks, the trouble with having a fleet of diesels & 20 some drivers behind the wheel of each of them, is that we went through turbos all the time, after our equipment shop installed pyrometers on every diesel engine, they started buying less turbos, they called every driver into a conference room & gave a short class on driving diesels. They then put a little sticker on the dash boards right next to the pyrometers, it read: shut down procedure, idle engine for 3 minutes or when the pyrometer drops to 3, which ever comes first. Never let engine idle for more than 5 minutes
. We even had a shop supervisor that would go out into the field to the larger operations, he would pull the keys out of any truck that idled for more than 5 minutes, the SOB would then take the keys back to the shop with him, that would slow up the operation because the driver had to get a ride back to the shop to sign for the keys, get a lecture, & receive a letter in his employment file. Needless to say, the turbos lasted longer & the shop only had to replace them because of defects & very high mileage.
sorry for the rant, i just like venting once in a while