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My daughter owns a 2015 Forester. Bought it new. The first two years when she R&R the snows/summer tires, the lugs came off with no problems. Did it by hand. Last year, she took it to a dealership and they broke off two studs. They told her the lugs were frozen. This past Friday, same issue occurred. The lugs are chrome plated. Anyone else experience this?
 

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2007 Forester Sports XT 4EAT
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@bfmgoalie I see this is your first forum post, so welcome to the forum from Oregon! :biggrin:

Take a look at my Google custom forum search results for: "wheel lugs breaking off". Scroll down to the results. :wink:

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Bobby...

['07 FSXT MODding Journal] ['03 X MODding Journal]
 

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1999 A/T - 235,000 mi. WA state
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923 Posts
back in the days when I was doing my own wheel changing, I would once (didn't repeat doing it on later changes, FWIW) run a small bead of oil over the stud threads before I replaced the lug nuts. Worked for me.
 

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2007 Forester Sports XT 4EAT
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I always use a torque wrench to correctly tighten the lug nuts, using the recommended "star" pattern.

My favorite assembly lubricant... fastener coating is Lock-Ease. I've been using this since I was a kid with my first car... a used 64 VW bug. I've never had broken studs or seized nuts. :wink:

Lock-Ease goes on as a liquid. The solvent dissipates, leaving a graphited rust preventative coating.

Bobby...

['07 FSXT MODding Journal] ['03 X MODding Journal]
 

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2018 Forester 2.5i 6MT
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478 Posts
I usually put a small amount of oil on each lugnut. With the lugnuts on our Subaru, it's the taper in the lugnut and wheel that keep it tight, not the threads. But if the threads get rusty, then things get stuck.
 

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2012 Forester X Auto
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In a corrosive environment, some form of lube helps, and many things will work.
ATF seems to also do the job, and it's a cheap alternative.
In all cases, a little goes a long way.
Another option is Teflon lube, which is also great for motorcycle chains.
It seals the threads and doesn't attract dirt like most other petroleum products.
A small squirt and the threads can be sealed from the outside as well.

A major cause is over-torque of the lugs, which can cause problems by itself.
An air gun in the wrong hands can easily double the recommended foot pounds, and if you add some salt...
Gee... Your lugs broke because they were frozen... Who could have predicted that ?????
@smiffy6four mentioned a good idea that most tire places will tell you to do as well...
Check the wheel lug's torque after driving. Primarily to catch a loose lug missed by mistake.
I also check to make sure the lugs aren't too tight by setting the wrench higher...
Places that fix flats don't seem to have any settings but maximum on their air wrenches...
 

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2017 Forester 2.5i MT
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Past threads (no pun intended) on lug nut torquing have had engineers chime in that the manufacturers torque values include the friction encountered with dry threads. Any lubricant will cause you to miss the target torque. But lot's of folks do it, and I have not heard of too many wheels falling off.
 

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2007 Forester Sports XT 4EAT
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Per the Subaru technical service documents:
'03 - 90 N·m (9.1 kgf-m, 65.7 ft-lb)
'07 - 100 N·m (10.2 kgf-m, 73.8 ft-lb)
Per the Owner's Manual:
'03 - 58 to 72 ft-lb (80 to 100 N-m, 8 to 10 kgf-m)
'07 - 58 to 72 ft-lb (80 to 100 N-m, 8 to 10 kgf-m)
We apply a light coating of Lock-Ease, graphited lock fluid on the lug nuts & wheel studs. We always use a torque wrench to torque the lug nuts to 80 ft-lbs, using the recommended star pattern.

No issues with studs breaking off on either of our Foresters.

► Disclaimer - this is NOT a recommendation, just what we do. :wink:

Bobby...

['07 FSXT MODding Journal] ['03 X MODding Journal]
 
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