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Sahuarita, Arizona USA 2018 Forester Limited
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2,345 Posts
It should be 16mm. Many 2014-2018 owners have replaced the dinky factory engine oil drain bolt with this:
The head on the above is 17mm so 16mm must be the thread spec. It fit my 2018 perfectly.
 

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2018 Forester Touring Automatic
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10 Posts
I just did my oil change and replaced the factory Oil Drain plug with a 16x17 Part#: 807016210 (16mm thread / 17mm Head) and it fit perfectly. The one that comes with the '18 Forester Touring was a 14mm head and it was starting to get rounded. So glad I ordered the larger size nut! Attached is the part for an '18 Forester Touring. The larger nut size is a little longer than the 14inch but no issues.

544615
 
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