no more than 3000 miles
5000km on regular oil 15k on syntetic
As the additives wear out and the oil ages it will change to a dark brown color just like regular oil
It depends. Usually they should be checked when you do your regular 3K oil change. If the filter is dirty--a dark gray--then it should be replaced.
Usually the oil filter of the car is changed when the oil is changed. The oil change should be done on regular bases after like 3000-5000 miles or when the car is brought to the garage for a service.
Yes you can.
The regular change of oil will not significantly show any change in fuel consumption, if considered over short period. The regular oil change will help in maintaining good engine health and power. It will also increase engine's life. In long term there will be saving in consumption of gas.
its the same process as changing synthetic oil, except you use regular oil.
As long as it is not a requirement of the engine, such as with VW's, Corvettes, Vipers, Mercedes, and some other higher end cars, then there will be no problem. So if you have an Accord, like the category you put it in, then you should be fine.
No, you can mix them together if you so wish. But know that you cannot extend the oil change interval if you do not use 100% synthetic and should change the oil/filter every 5,000 miles.
both
You dont change transmisión oil. The regular oil is all you need.
This depends on the oil that goes into the car. If it is synthetic you need to change it every 10,000 miles if it is regular than it needs to be every 3000-3500 miles.