By this time, McLaren was forced to take a customer supply of Ford V8 engines, which were two specifications behind that of Ford's then factory team, Benetton. McLaren hoped to make up for the inferior horsepower with mechanical sophistication, including an effective active suspension system – though the system itself proved difficult at times, especially for new teammate Michael Andretti. With this plan, Dennis finally persuaded Senna to stay with McLaren. The Brazilian, however, agreed to do so only for the first race in South Africa, where he would assess whether McLaren's equipment was competitive enough for him to put in a good season. After driving McLaren's 1993 car, the &lt;a href="McLaren%20MP4/8"&gt;McLaren MP4/8&lt;/a&gt;, Senna concluded that the well-balanced new &lt;a href="McLaren%20MP4/8"&gt;MP4/8&lt;/a&gt; car had surprising potential, albeit with a Ford V8 engine down on power relative to Prost's Renault V10 and less so on the Benetton's factory V8. Senna thus extended his deal with McLaren on a race-by-race basis instead of a full-year contract, ending up staying for the whole of 1993 in any event. Reportedly, this engagement was on a $1 million per race basis and, despite midseason testing with a Lamborghini V12 proved encouraging, with McLaren then signing an engine supply deal with Peugeot for the season, it all proved insufficient to continue to retain Senna past 1993.