Check out the internation Engine of the Year Awards: - 
  
Summary of the IEOTY winners for 2006 
  
International Engine of the Year BMW 5.0-liter V10  (M5 + M6) 
  
Best New Engine Volkswagen 1.4-liter TSI Twincharger  VW Golf - (European model) 
Best Fuel Economy Toyota Hybrid Synergy Drive  (Toyota Prius) 
Best Performance Engine BMW 5.0-liter V10  (M5 + M6) 
Best Above 4.0 liters BMW 5.0-liter V10  (M5 + M6) 
Best 3.0 liters to 4.0 liters BMW 3.2-liter  (BMW M3 + BMW Z4) 
Best 2.5 liters to 3.0 liters BMW 3.0-liter twin-turbo diesel  (European models) 
Best 2.0 liters to 2.5 liters Subaru 2.5-liter Turbo  (Forester, Impreza, Saab 9-2X) 
Best 1.8 liter to 2.0 liters Volkswagen 2.0-liter FSI Turbo  (Golf, GTI, Jetta, Passat + Audi A3, A4) 
Best 1.4 liter to 1.8 liter Toyota Hybrid Synergy Drive  (Toyota Prius) 
Best 1.0 liter to 1.4 liter Volkswagen 1.4-liter TSI Twincharger  VW Golf (European model) 
Best Sub 1 liter Honda hybrid 1.0-liter IMA  (Honda Insight) 
  
2005 Winners 
Best New Engine: BMW 5-litre V10 (M5, M6) 
Best Fuel Economy: Toyota 1.5-litre Hybrid Synergy Drive (Prius) 
Best Performance Engine: BMW 5-litre V10 (M5, M6) 
Sub 1-litre: Honda 1-litre IMA (Insight) 
1-litre to 1.4-litre: Fiat-GM 1.3-litre Diesel 
1.4-litre to 1.8-litre: Toyota 1.5-litre Hybrid Synergy Drive (Prius) 
1.8-litre to 2-litre: Volkswagen 2-litre FSI Turbo (Golf GTi, Audi A3, A4) 
2-litre to 2.5-litre: Honda 2.2-litre Diesel (Accord, CR-V, FR-V) 
2.5-litre to 3-litre: BMW 3-litre Twin-Turbo Diesel (535d) 
3-litre to 4-litre: BMW 3.2-litre (M3) 
Above 4-litre: BMW 5-litre V10 (M5, M6) 
International Engine of the Year 2005: BMW 5-litre V10 (M5, M6) 
  
Sorry guys, no sign of a Nissan engine. BMW winning all the important ones and the V10 winning performance engine 2 years running... 
  
Click http://autos.msn.com/advice/article.aspx?contentid=4023213 
  
Click http://www.ukintpress.com/engineoftheyear/previous04.html