The Bmw m50/s50/m52 in the e36's are very reliable if you maintain the cooling system.The only reason those motors ever die seems to be people don't do preventive maintenance on their cooling systems so they end up leaking coolant and people keep driving them so the head warps or cracks. E36 are fairly cheap too.
The e46 is nice but quite a bit more expensive I don't believe they have cooling sy
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