my 1990 BMW 535 had 10 way adjustable electric seats.It also had a battery under the back seat to suit(and a 25AH auxillary in the boot).It started to do strange things if the battery was near the end of its life.I got a proper battery for it,ie what BMW actualy recomended.I dint have any issues after that.And for the record i got the 535 at 140ks and sold it at 260ks.I had it for about 8 years used every day.It let me down once.Fantastic car.
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