How many times do we see vehicles, especially cars advertised with high mileage and the seller says it's okay because they are motorway miles? Unfortunately this is a misconception, a car that has constantly been driven up and down a motorway is more likely to wear out quicker than a car just driven to the shops every day. Why? Well, when an engine reaches its optimium running temperature the engine oil and anti-freeze start to loose their efficiency over a period of time. Without going into too much boring technical detail the molecules of the oil break down the hotter it becomes and therefore running an engine for long periods of time at high speeds increases this process. Different oil manufacturers add certain additives to help say, clean the engine and reduce wear but these abilities are slowly lost each time the oil is super heated for long periods.
Formula One Teams certainly wouldn't leave the same oil in their cars for more than one race neither do any other form of racing, motorbikes are a good example of this due to the high revs of the engine.
Anti-freeze, this can be more important than engine oil, because it has an effect on the oil as you will see. If anyone thinks they put anti-freeze in their car just to stop the engine freezing, then think again. Agreed this is one reason but a far more important role is raising the boiling point of water. The last thing you want is the water in your car to start boiling and so manufacturers add anti-freeze. Anti-freeze has a life span usually 3 to 10 years depending on the brand. I own a Ford so their anti-freeze is good for 10 years but cheaper brands do not last very long. If you are experiencing the temperature guage on your car going up when travelling slowly or in heavy traffic or under load, it might well be you need to change your anti-freeze. So anti-freeze is just not for the cold winter months, it is needed all year round to help keep you engine cooler and in theory it is needed more so in the hot summer months. So back to the oil in your car, if your car runs very hot then it affects the molecules breaking them down, good quality anti-freeze plus a quality engine oil means a healthier engine.
I recently changed the anti-freeze on a friends car and flushed the whole cooling system (10 year old Ford Fiesta) and they said they immediately saw a difference. When the heater was put on in the car they said it didn't feel as hot and the engine seemed to start easier than before. Sometimes if a car's engine gets way too hot then the petrol can evaporate in the carburettor or fuel injectors when you stop and so can take longer to start when you get back in it again.
So don't ignore your anti-freeze and think it's a ploy to get more money from you by manufacturers nor buy cheap oil sold by certain shops, buy the best cos your engines worth it. If anyone needs anymore info or doesn't quite understand , drop me a line, no charge .....and remember 50% water-50% antifreeze when you top your radiator up and make sure you put the same type of anti-freeze back in...look at the colour or check the owners handbook...don't mix your anti-freeze.....