The driver’s window of the average car does a lot more work than any of the other power windows on board. What can happen over time is that the tracks the window glass runs in become clogged with dust and debris or simply go dry, meaning there’s excess friction when the glass is trying to change position. Thanks to gravity, this is usually most often seen when trying to raise the glass.

You can try a dry lubricant spray which typically contains graphite to grease the tracks slightly, but don’t overdo it. And try to avoid liquid lubricants as these will smear the glass. If that doesn’t work, you may have to take the door and glass apart to find the problem. It could also be that the electric motor that does the work of moving the glass is worn and not providing the necessary power.

In the meantime, you can help the motor by grabbing the top of the glass and using a little elbow grease to help it make the journey. Just make sure you don’t get your fingers in the way as the window shuts.

Even though this model Camry has an official combined fuel consumption figure of 7.9 litres per 100km, the exact number of kilometres you get from each tank of fuel will depend hugely on how and where you drive the car. If your driving is all around the city and suburbs, you might average, say, nine litres per 100km. If it’s all freeway work, then that figure may tumble to as low as seven litres per 100km. Drive the car really gently and you might even get that figure to drop into the sixes.

In any case, the (higher) city figure means the Camry’s 70-litre fuel tank should take you around 750km before you need to fill up. On the highway, meantime, the same 70 litres should carry you almost 1000km before you need to start looking for a petrol station. In reality, of course, the only direction with such projections is down, and every cold start, traffic jam and headwind will take kilometres off those figures.

Check that the engine-oil dipstick is seated in its tube correctly. If it's not, this could be a great place for oil to escape and become plastered all over the engine. It's the small yellow, plastic loop just below the oil filter. While you're there, check that the oil filter itself hasn't come loose. Try to tighten it by turning it by hand clockwise. If it moves at all with hand pressure, it's loose.

The most likely culprit, however, is the rocker cover gasket. If this seal breaks, oil can be free to migrate out of the engine, right down the side of the cylinder head and crankcase, making the mess you've described. To check, clean the engine with degreaser and water until all the oil is gone. Then take the car for a decent drive, open the bonnet and the source of the leak may be very obvious.