Is it safe to put Comma Copper Ease or similar on wheel bolts to make the removal of a wheel easier at the roadside? I ask this because I recently had a puncture on my 2003 Ford Galaxy and found it a struggle to remove the wheel bolts even though I have a decent pry bar. I have read on various internet forums that some people do put lubricant on the bolts, but others advise against it because it can affect the tightness of the bolts. R Broglia It is very tempting to put a coat of copper grease lubricant on the threads of wheel bolts in an effort to ensure they will come undone easily. However, such lubricant on the thread of the bolt will alter the friction in the thread and greatly affect the torsional stress applied to the road wheel. Thus the general advice is that the thread of a wheel bolt should be clean and dry when fitted.
Ford advises that lubricant should not be permitted to get on the cone sets of stud holes or on the cone angle of wheel nuts. If corrosion is slight, you should wire brush away the corrosion. If corrosion is excessive, install new wheel studs and nuts. If the condition persists, lubricate the first three threads of each wheel stud with a graphite-based lubricant.
From personal experience, I find that if the wheels are removed during regular servicing and the threads are kept clean and dry, torqueing the wheels up to the recommended setting is all that will be required. From the data I have, the road wheels on your Galaxy should be torqued to 170Nm (125lb ft).