Tonight I was accelerating from 4th gear into 5th and I put the pedal down a bit more spirited than normal driving, and then a plume of darker smoke cane out of the exhaust and temporarily blinded the guy behind me. It's given puffs before under spirited acceleration, but this one was a bit bigger. I'm running rotella T6, have around 189k km, and have noticed a slow drop in mileage over the past several fill ups.
My question is:
Is the turbo dying?
thanks,
eric