Highest win rate
The data below represent the amount of races that an engine manufacturer has won.

Engine # 1 Offenhauser 91,667%   2 Climax 41,237%   3 TAG 36,765%   4 Vanwall 35,714%   5 Ford 33,588%   6 Renault 27,494%   7 Ferrari 26,832%   8 Mercedes-Benz 24,701%   9 Repco 24,242%   10 Honda 22,086%   11 Maserati 10,280%   12 BRM 9,524%   13 BMW 7,950%   14 Alfa Romeo 6,103%   15 Weslake 5,556%   16 Mugen Honda 2,721%   17 Porsche 2,703%   18 Matra 2,419%