0W-30, 5W-30 or 10W-30. They all work perfectly.

No problem, just that it is less fuel efficient and more draggy.
The rule of thumb is that if your high mileage car does not consume engine oil, just continue to use the ideal viscosity. No need switch to more viscous fluid.

For those who don't know when to use rear fog lamps. Please watch the video again:

WATCH HERE

In short, only turn them on when there is heavy rain of fog. Not for some other reasons which you created on your own. Let's hope there is a mutual understanding on this proper usage.

This post has been edited by mayalab: Jul 3 2016, 11:29 PM

1. It is a norm to see uncivilized driving behaviour in our everyday life. Tailgating is one them.
For most of the scenarios you can easily let the tailgaters overtake. The action of turning on the rear fog light to 'counter' the tailgaters is just as uncivilized as tailgating itself. Such hostile approach is unlikely to be productive.

2. Turning on the hazard warning light (as in double signal) during heavy rain is actually not very correct as well. Such practice is pretty common on road, so this statement might come as a surprise to many drivers out there. Why is it so? Because other drivers cannot anticipate your next move when your hazard light is on continuously, so you have increased the risk of accident indirectly. Actually this is quite a common knowledge, just that most drivers are not properly taught in Malaysia.

All these lights are created for effective communication between drivers on road, so mutual understanding on the significance of each light is critical. Misuse of lights can only lead to confusion, unnecessary slowdowns, and even accidents.