Synthetic oils are improving all the time but there is still one problem that oil refiners have not been able to conquer – making engine oil more effective at lower temperatures. See it like this:

Premise 1: Oil becomes thicker in cold temperatures.
Premise 2: Engine parts do not move effectively without the lubrication oil offers.
Conclusion: In cold weather, your car is harder to start.

What your car also needs to start is fuel (petrol/diesel). Petrol cars use an ‘ignition compression’ method to start whilst diesel cars compress the fuel to ignite it. Petrol (and diesel) is oil that is refined to a higher spec so when it is cold, petrol contracts just like oil does – it becomes thicker. This is why some people will only buy fuel at night when it is colder! Old cars have a manual choke which allow you to judge how much more fuel your engine needs whereas, newer cars have an automatic choke that do this for you.

So now we know the basics behind why your car finds it hard to start on a cold morning, we can now discuss methods to make it start.

Tips for making your engine turn over on a cold morning

- A little sun light can warm your battery up. If you have the time and the sun is out, you can put your car in direct sunlight. Open the bonnet and leave it for 10-15 minutes.
- Be careful not to flood your engine with fuel otherwise your car definitely won’t start. If your engine won’t turn over the first time, don’t keep turning the key or holding it in position to hear the engine go chug, chug, chug, chug, chug, chug! Instead, turn the key for a maximum of five seconds and leave 30 seconds or more before trying again.
- Have your car serviced regularly. Change to a winter-grade oil if at all possible.
- Turn all of your electrical accessories off in the vehicle. So this means no lights, heater, wipers, and radio – anything that requires battery power should be switched firmly off.
- Don’t touch the accelerator when the car is either trying to start or has just started. You will cause damage to the parts as the oil is still thick and working its way around the engine.

And finally…

Stay with the car whilst you’re warming it up – thieves target car owners on cold days so don’t warm your car up for it to be stolen.

Source:

http://ezinearticles.com/?How-to-Start-Your-Car-on-a-Cold-Morning&id=3286831

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