I'd be more tempted to leave the oil in place and change that D+ out after seeing several torn lately than to change the oil and leave the filter. I'd be wanting that thing off if it was me.
As for the oil six of one half dozen the other. I'd probably run the 5w20. Heck I just put some old High Zinc QS Defy in Lauren's Lexus here in Florida in a 5w20, clearance oil from last year. Previous fill was VSP 20w50 which also would've been just fine for the winter here. Still using up stash oils from last year.
P-3C and P-8A Maritime Weapons and Tactics Instructor, Instructor Tactical Coordinator and Mission Commander