How much oil is left?

According to BP Statistical Review and the IEA (International Energy Agency), there are about 1.6 trillion barrels of proven oil reserves in the world. At the current level of consumption (approximately 100 million barrels per day), this amount will theoretically last about 45-50 years.

But it's not that simple. These estimates:

do not take into account new discoveries (exploration technologies continue to develop);

do not include shale oil and oil sands, the reserves of which are significant;

assume a stable level of consumption, although it may change due to crises, the transition to renewable energy sources, etc.

So the real term may be longer than 50 years, but the question is not only about quantity, but about the price and the environmental cost of extraction.

And what about cars?
As of 2025:

There are more than 1.4 billion cars in the world, of which about 95% are with internal combustion engines.

Electric cars make up about 2-3% of the world's car fleet, but their growth is exponential.

By 2035, the EU and a number of other countries plan to ban the sale of new cars with internal combustion engines.

However:

In many developing countries, cars with internal combustion engines will remain relevant for at least another 20-30 years.

The infrastructure of charging stations is still far from ideal.

Electric cars are still more expensive, and their production is also not harmless to the environment.

What will happen next?
The next 10 years are a period of active coexistence. Electric cars will gain share, but ICE will remain widespread.

2035–2045 is a possible peak of electrification. In developed countries, ICE will gradually disappear from new sales.

2050 and beyond — ICE will become history. But they will not disappear completely: they will remain in military, agricultural machinery, freight transport, and partially in aviation and shipping.

Total:
There will be enough oil for another half a century or more, but not at the same price — its extraction will become more expensive and difficult.

Cars with ICE will be relevant for at least another 20–30 years, especially in countries with developing economies.

Electric cars are the future, but it does not come immediately and not everywhere at the same time.

Conclusion:
We live in a transitional era. ICEs are not dying yet, but their age is coming to an end. Oil will still be an important resource, but the energy pendulum has already begun to swing towards alternatives. The question is not whether "gasoline cars will disappear", but how prepared we are for life without them.