Titles   Engine            Nat.

15       Ferrari           ITA*
-------------------------------
13       Ford              GBR*
-------------------------------
11       Renault           FRA*
-------------------------------
10       Mercedes-Benz     GER*
-------------------------------
6        Honda             JPN
-------------------------------
4        Climax            GBR
-------------------------------
3        TAG-Porsche       GER
-------------------------------
2        Alfa Romeo        ITA
         Repco             AUS
-------------------------------
1        BMW               GER
         BRM               GBR
         Maserati          ITA

* = Active engines