It's actually written on the car to put in six litres instead of 5.5. And the dealership I use lets you in to watch them do it, which is nice. And it helps to make friends with the techs 
98 Silver Frost SVT
97 BMW 540I Sport, six speed
"Blue is for sky, black is for soil, and white is for simplicity, purity and hope for the future"
"A coveted car should never stunt your life, but should make it more rich and interesting."
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