 His belief was that regardless of reliability, the McLaren-Lamborghini would at least be as fast as both the Williams-Renaults and Benetton-Fords who he was struggling to keep up with in races using the customer spec Ford V8 (though Senna won in Japan using the Ford V8 and backed that up with his last ever win in Australia).Senna even allegedly rang Ron Dennis from the pits during the Estoril test (according to reports Dennis took the call in his private limo as he was in England at the time) and told him that he felt that they should seriously think about using the V12 instead of the V8.The potential for the car and engine was there for all to see.