oddly enough, an engine with a higher cylinder count doesn't need as much power as there are more firing strokes per revolution. which means it would be easier to start.

as for the required power, i just use an optima in my 90 300E and am planning to get one for my new (to me) 94 E320. smaller than the recommended battery, but powerful enough to crank it every morning.

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'O=00=O'
bmw 2002.
long live the legend