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I actually have an 850, and i have to say (so far) its been trouble free apart from its apetite for brake disks and tyres (which it eats at a rate, but then again it really handles, goes and stops...so its GOING to eat them!)
Having worked on 144's, 245's, 744's. 745's and 945's i would also say the buid and fit quality is slightly better on the 850....maybe just on mine, maybe i just got a good one....its only got 85k on it so far so time will tell...
You misread my posts, its NOT that I dislike b230f's. the fact i still have one and look after a couple of others should tell you that, its that i dislike some of the BS that seems to float around here that they all run for 500k miles with no more maintenance that checking the oil...they dont, its a fact they just dont..
IF you get a good one, and it well looked after AND your prepaired to put the time and money in you CAN get very high miles...but certainly its not the rule its the exception...
the people on here are self selecting to being prepaired to do it...hence quite a few people have high miles examples, but similarly go through the posts and see the number of 100-150k engines with issues (issues that would lead a lot of those same people who will rebuild a b230f from scratch at 250k to say 'its white block - scrap it' if a white block had the same issues at half the milage) - you yourself have just sort of proved the point with the comment about white block rear seals...at 250k it would not be uncommon on a b230 to have replaced the rear, certainly the fronts...yet you mention the 850 rear...
the POINT is not the quality of the engine (like i say i have one)...but the mythology that floats around...its an engine..it was designed by engineers..built by a factory...like all such devices you get saweat ones, you get dogs and most fall somewhere in the middle, basic laws of physics and production...
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