If your engine is smoking a little bit on start up, odds are your valve stem seals are bad.A failed seal will allow oil into the combustion chamber that burns and causes smoke.Not only that, they create extra carbon in your engine and can potentially foul out spark plugs.Replace yours today, one required per valve.Brand: TOPRAN Product Nr: 100254001 valve stem diameter [mm] 7 material FPM (fluoride rubber) Compatible with OEM numbers; Alfa Romeo 4265701 Alfa Romeo 4357028 Alfa Romeo 46436047 Alfa Romeo 7553616 Alfa Romeo 7581344 Alfa Romeo 7582158 Alfa Romeo 7650355 Audi 027 109 675 Audi 027 109 675C BMW 1 288 544 BMW 1 305 054 BMW 1 460 849 BMW 1 706 580 BMW 9 059 171 BMW 9 059 172 BMW 1134 1 288 544 BMW 1134 1 305 054 BMW 1134 1 460 849 BMW 1134 1 706 580 BMW 1134 9 059 171 BMW 1134 9 059 172 Citroën 0956 28 Dacia 7700 103 872 Dacia 7700 736 465 Dacia 8200 234 651 Fiat 4265701 Fiat 4357028 Fiat 46436047 Fiat 7553616 Fiat 7581344 Fiat 7582158 Fiat 7650355 Ford 1 669 785 Ford 95VW6571BA General Motors 09110586 General Motors 9110586 General Motors 93160891 Mercedes-Benz 000 053 48 58 Mercedes-Benz A000 053 48 58 Nissan 1320 76F 900 Nissan 1320 76F 901 Nissan 1320 7AW 300 Nissan 1320 7AW 301 Opel 44 02 586 Opel 44 12 186 Peugeot 0956 28 Renault 7700 103 872 Renault 7700 736 465 Renault 8200 234 651 Seat 027 109 675 Seat 027 109 675C Skoda 027 109 675 Skoda 027 109 675C Vauxhall 09110586 Vauxhall 93160891 Volvo 30638662 Volvo 30889394 VW 027 109 675 VW 027 109 675C