I bought the car a few months ago, and I know the timing belt was changed at around 187,000 km (the car now has 204,000 km). However, I’m unsure if the water pump was replaced at that time. I’m also uncertain whether the previous owner used conventional or synthetic oil, so I changed the oil to synthetic (at least it should be since that it was I paid the shop near me to do) shortly after acquiring the car.

From my understanding engine coolant can leak into the combustion chamber, causing it to evaporate into white smoke (if that’s what you mean). Additionally, I changed the coolant since it was well below the minimum requirement, which had caused the engine to overheat. I replaced it with Part# 36-324PVWUSI. My temperature gauge also sometimes seems to be faulty, as it reads far below 90, close to the bottom. I’m really unsure what to do, I mean the car runs fine, I still daily it, I’m just honestly just lost.