Forgot to mention, the oil tubes in my 400E are also aluminum. I was amazed by the condition of the camshafts, after 210K km on them, them show no wear at all.
99 BMW 540i 6-speed 110K Km
03 SAAB 9-5 wagon 80K Km
92 400E (Sold) 245K km
Still missing the days with the Benz, it kept me busy.