Lots of reasons, huge. do want a list of the 50 reasons or 10 tests using up to 10 tools you dont have. or what is the real question. 99% of most people get the car serviced. are you the 1% ?
one top reason is not getting a full tuneup. but that is a wild guess, based on pure statistics.
which engine? if cant know even that get car serviced if savvy you'd have posted a photo of your engine you did not, and makes help, impossible or worse invites wild guessing crowd.
Answers & Comments
Lots of reasons,
huge.
do want a list of the 50 reasons
or 10 tests using up to 10 tools you dont have.
or what is the real question.
99% of most people get the car serviced.
are you the 1% ?
one top reason is not getting a full tuneup.
but that is a wild guess, based on pure statistics.
which engine?
if cant know even that get car serviced
if savvy you'd have posted a photo of your engine
you did not, and makes help, impossible
or worse invites wild guessing crowd.