Kubica: BMW reliability is crucial factor

The Pole won his first race in Canada last weekend, a result that elevated him to the top of the standings - four points ahead of McLaren's Lewis Hamilton and Ferrari's Felipe Massa.

Kubica had a luckless 2007 season, with several mechanical problems striking during the year, and credits the team's improved consistency for his current position.

"I did not expect to be leading the championship after seven races, as our car is not the absolute fastest on the grid," said Kubica.

"However, we have total reliability. We were still experiencing a few problems in this area last year, but since then we've made huge improvements.

"Added to which, the pit crew has done a great job, as has everybody in the team."

Prior to Montreal, Kubica had already claimed three podium finishes this season and has the best 2008 qualifying average of any driver on the grid.

But he is taking nothing for granted in the remaining races, and said he just wants to make the most of his current opportunity.

"I have collected points regularly so far this year, but of course I don't know if that is going to continue," Kubica said.

"I will focus on the Grands Prix one at a time and try to take maximum points in every situation. Of course, consistency is an important factor, and I hope that we are also able to make further improvements to the car. Then we can achieve good things.

"Whatever happens, we have to do all we can to make the best of the situation. After all, who knows if I will ever get a chance like this again. One thing is for sure - I'll be giving it everything."