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After I have been working with a few M104 this year I can just say one thing. Mercedes misstake engine.
We compare both M103 and M104 several times with both turbo and non turbo but both with a megasquirt.
With a same good tuning map M104 drink more gas then M103. Why???
M104 goes warmer then M103. Warm summer day in trafic M104 can not stay cool as good as M103.
Bad water chanels in M104 head, very sensitive for a heat.
Even mercedes benz workshop in sweden notise a lot of broken head gaskets and a lot of head problems of M104
I can understand why the M104 was producing only a few years.
M104 is pretty good engine if it is in very very very good condition.
But M103 is much better engine on every way, turbo a non turbo.
But a new M104 e280/e320 is veeeeeeeeeery nice engine.
Not so strong like M103 but very nice, strongest inline 6 and most economical inline 6. Best non turbo inline 6 ever.
Good turbo everyday drive setup
M103 stock as hell
60mm inducer turbocharger
megasquirt extra
twin entry manifold with twin wg pipes to the wg valv
(makes a lot!!!) Fast, soft spooling curve
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