Porsche Alternator 964 993 89 98 LMA339 91455203910 European style for 914 914 6 models Model And Year:928 (1983 1986) European style for 914 914 6 models Fully Synthetic: Provides superior protection and performance compared to conventional or mineral based gear oils these super efficient units are based around the latest generation of alternator technology These race proven compact alternators offer the best size and power weight ratio available and at far lower rpm than alternatives due to their patented design which enables them to offer up to 80% of maximum output at average idle speeds catering for the large electrical loads usually found at this time