05-02-2018, 05:05 AM
I certainly did not intend to imply that leaving the cap on would not work, because yes, the oil will still drain. That said, it has been my experience that removing the cap first does work a bit more efficiently for most of the vehicles I have worked on. When in doubt I defer to the Shop Manual, and in this case, step one is to remove the oil filler cap. Just food for thought, and use the procedure you have the most confidence in.
