What maintenance should be done at 100,000 kilometers? Do the transmission oil and gear oil need to be replaced?

The lower control arms usually need to be replaced after 100,000 kilometers, as they generally tend to crack by then.

Basically, everything is needed.

It's best to replace the transmission oil.

How to solve high fuel consumption? Sometimes the engine noise increases on its own for a while, then decreases, and this cycle repeats. Is it for cooling? Is it normal? What could be the problem if there's a noise when starting the engine?

Transmission oil, engine oil 5w30, brake fluid, check brake hoses, brake pads, calipers, air filter, air conditioning filter, fuel filter.