Join Date: Jul 2011
Location: Cologne, Germany
you can't really go wrong with NGK plugs, imo.
your USA 90' spider should have the Motronic cat engine like the S4 spider (engine codes: AR01544, or AR01588, or AR01590 - the engine code is the first 5 digits of your engine number, my euro S4 has AR01588), for which the NGK catalogue lists:
Dom - Alfa Spider 1990 S4 - formerly: Alfa 101 Sprint, 2600 Sprint, Montreal - family classics: Jensen Interceptor II, '58 Hooper RR Silver Cloud I, Shadow II, '60 Corvette.
Last edited by spiderserie4; 11-25-2016 at 01:06 AM.