Sayjac, I did find one problem on a puro synthetic. The o-ring on the tip was too thick, you could not push it in pilot hole with your hand, used the old o-ring, went right in. If it won't push in by hand, maybe that is why some are getting squished. That's just a test fit then I click in the oil cap and install. Use oil or grease on the o-ring so it goes in ok.
2016 Challenger R/T Hemi 6-speed.
2012 Equinox 2.4-Wife's Ride