Watch out! I don't know if you are aware of this, if you plan to put an old supra in-line 6 turbo motor in your 300E, make sure the head gaskets have been replaced with some modified one, nearly every older Supra Turbo motor (not the new Twinturbo one) blew its OEM head gaskets at the mileage of 70k-80k, that's why HKS is still selling so many metal based head gaskets to Supra owners. Strange enough though Supra owners tried hard to fight with Toyota, but there has never been a recall, maybe only some secret settlements with some aggressive individuals.

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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.