Diesel smokes (black smoke)
The first thing you need to pay attention to is the condition of the dust filter, if it is clogged with black soot, disassemble it and throw out the inserts (the filters themselves)

When buying rear hubs for a car, you need to consider that there are old-style and new-style hubs.
Let's look at the main differences between the hubs so as not to confuse them during installation.