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That's just not correct. The 3.4 DOHC really isn't a high maintenance engine. The weaknesses are the alternator(most go around 100k miles- same as most other cars) and the timing belt. The timing belt is a wear item and should be replaced every 60k miles. The 3.1 and 3.4 are both based on the same block, to say one is more reliable than the other is simply not true. Some shared problems with the 3.1 and 3.4 are the dist o-ring oil leak and the problems with intake manifold gaskets sealing. If you really want a low maintenance Monte, the best bet is the 3.8L Z34 from 98-99.
My 3.4 has 135k miles on it now, I've replaced the timing belt once and the alternator once. I haven't had any problems other than that. For the last 15k miles, I've been running 7 psi of boost from a turbo with no problem. If you perform routine maintenance(like you should on every engine), the 3.4 is a VERY strong motor. Stock I had 50 more horsepower than a LS, now I have over double the horsepower of the LS. I think I'll take the 3.4 and deal with timing belt changes every 60k.
Tim
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1995 Z34 KYB, Eibach, Blitz/RSM intake, custom exhaust, custom stereo.
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