2006 BMW 325 Reuse or replace the fastener

2006 BMW 325
101,852 MILES • 6 CYL • 2WD • AUTOMATIC
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BRUSKY
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Bentley's advises/instructs BMW says not to reuse fasteners.
Any torqued aluminum bolt(trans pan) will stretch, that I
understand, don't reuse. Do steel bolts have the same requires?
I have the complete R&R of cooling system from Rad to heater hoses project ahead of me and are getting the necessary parts in hand.
Are all those steel nuts/bolts,washers to be renewed?

What do you recommend as system flush agent?
Sep 4, 2010 at 9:36 AM
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DOCHAGERTY
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Just the aluminum ones require replacement, the steel fasteners you can reuse at your discretion. The flushing of the cooling system is simply replacement with the correct coolant and de-ionized water mixture.
Sep 5, 2010 at 11:55 AM