we had there 3 chain , drop this year, this forum.
there are PPL that drive cars , with the motor screaming for help.
howling like a love struck dog in full moon.....
why is a wonder.?
yes, a long time...
and you are correct. fix chain, $400
oops , bad motor.
look for battered pistions.
heads off ,if true.
or , bore scope it.