If you wait to long to change your oil you can hurt your car. What excatly is a Bad oil change?
Depends on what you mean by "bad." If its bad as in low quality oil/filter it the long run it can damage your engine and in the short run give you less gas mileage. If its bad as in a idiot technician didnt tighten the filter or put the wrong oil, or not enough oil. Yes that can be very bad for your engine and damage performance.
No, it is not hurt the car's performance. The manual transmissions are not as sensitive for the oil type. If a wrong oil has been used, the only thing can happen is the tranny get worn faster, but even the worn manual tranny still not hurt the car's performance. manual transmissions not need to change oils as frequently, and a manual transmissions are much longer lasting than automatic.
Yes it does.
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Poor performance, poor fuel mileage,
A cheap car's performance really depends on how it is taken care of. You could have a really expensive car and not take care of it and it's performance be bad or have a really cheap car and take really good care of it and have it's performance be good. You should take the car to a mechanic to have it looked at and keep up with maintenance in order to have a good performance vehicle.
Fuel milage and performance will drop. The car may "stutter" and will not idle or run smoothly. If the plugs get bad enough. The car won't be drivable.
If not done right you can lose performance, handling and fuel efficiency.
IT can but it is not recommended. It will effect performance, gas mileag, and eventually hurt the motor
No. People often change grades of oil for the summer or winter.
Depends on how bad, a min to a few weeks if it is broken.
Yes, a bad cat can cause issues.