For 1968 BRM decided to cut their losses with the H16 and built the BRM P126 around the 3 litre V12 that had originally been intended as a customer engine. For the first race of the year two P126s and the P115 were taken to Kyalami. Spence was entered in both types and went with the P115 after setting a faster time with it in practice than with the new car. Starting 13th Spence managed 8 laps before a problem in the fuel system put him out. The P115 was not entered in a Formula One race again, and it was also the last championship Grand Prix for Spence who was killed practising a Lotus 56 at the Indianapolis 500.