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The expansion tank is a huge issue and there is tons of information on that, but yes, it will crack or even explode at some point. AFAIK BMW never made any improvements in the replacement tank but I could be wrong. The OE trans coolers seem to fall apart when you remove them and I don't think the reasonable quality after market ones are any worse than the OE and in some cases maybe better unless maybe somebody knows different ?? Again, just do some searching there are LOTS of threads about those items. As far as thermostats, I think there a couple of brands like Mahle and a few others that have been proven to be good if the OE one is a crazy price, again lots of threads about that.
As far as the o-ring for the sensor in the lower hose I think think the problem there is more that the plastic housing is not perfect and/or ends up distorting a bit so the teflon tape even around the original o-ring might be a better fix than replacing it.
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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)
Last edited by 80stech; 11-04-2025 at 07:58 AM.
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11-04-2025, 07:52 AM
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