Nick Heidfeld's BMW engine passed scrutineering prior to the Japanese grand prix weekend, as the German marque became the latest to be subject to the FIA's detailed conformity tests.

The 31-year-old's Singapore unit was compared with the homologated engine lodged by BMW-Sauber after this year's Malaysian grand prix.

So far in 2008, the V8s of Mercedes-Benz and Ferrari have also been tested and cleared as the FIA tests conformity with the current engine freeze.

Toyota's Timo Glock will have a fresh engine fitted for Saturday and Sunday's action at Fuji Speedway, but he escapes penalty for an unscheduled change due to the 'joker' rule.

With scheduled new engines in Japan, meanwhile, are both Ferrari drivers, Robert Kubica (BMW), both Renault drivers, Mark Webber (Red Bull), both Toyota, Toro Rosso and Honda drivers, and Force India's Giancarlo Fisichella.

Source: GMM