Hi mate I ment BMW E38.use to have 2 P38's as well, 1 was 1995 4.0 gems she would go 2 weeks easy 4.6 thor 2001 was like 4 days and flat and always a good battery, E38 is 740i M62 1997 and have know 2 months 50% battery and she fires up, seems the germans did not get much better ! mind my X5 E53...