Question

there is thick blue smoke coming from the tail pipe after the engine has idled for several minutes. what is one possible cause? a broken main bearing b reduced oil viscosity c worn piston rings d bad oil - pan seal click the button or type the letter next to your answer.

Explanation:

Blue smoke from the tailpipe often indicates oil burning in the engine. Worn piston rings can allow oil to enter the combustion chamber, leading to oil burning and blue smoke. A broken main bearing (A) causes engine knocking/noise, reduced oil viscosity (B) affects lubrication but not direct oil burning, and a bad oil - pan seal (D) causes oil leaks outside, not blue smoke from the tailpipe.

Answer:

C. worn piston rings