[thiaZ_]

pawn Код:

public OnPlayerExitVehicle( playerid, vehicleid )
{
    SetTimerEx( "PlsDeleteVehicle", 15000, 0, "d", vehicleid );
    return true;
}

forward PlsDeleteVehicle( vehicleid );
public PlsDeleteVehicle( vehicleid )
{
    DestroyVehicle( vehicleid );
    return true;
}

That's just a basic example, use

https://sampwiki.blast.hk/wiki/OnPlayerExitVehicle

for more info.