The 5 cylinder (617) is louder, durable, and seems like something of a throw back. It's hard to hurt unless something silly happens to it. Just a very solid motor... simple to work on. The 6 cylinder (603) is a bit more complex but not much, no need to be scared.



The 6 seems more refined, I supposed due to the firing order. It's much quieter and idles differently. I haven't had a chance to really drive mine much as I've owned it a week and have been out gathering parts in my off time. My tie rods are bent so it only goes about 30mph lol

603 motor does crack heads if over heated, it happens but you just have to keep the eye on the vital signs. Something you should do anyway. I'm very pleased with this vehicle so far, seems like it will be load of fun.



The 603 is what 143hp vs 120hp and I believe torque went up from 170tq to 195tq also, so it should run a bit better too.

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'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

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