What I have thought was a parasitic batt drain turned out to be most probably a problem with my OEM starter. It had been limping along for a couple of years until it finally croaked and left me stranded. Got a tow home and watched a YT vid and rolled up my sleeves and replaced it...on a very cold day outside. It's quite a job to even get to the thing. And the 17mm bolt mounting the starter was a bear to get off. But I was victorious. Car has been starting like a champ for weeks now. Aftermarket but new starter from Amazon. Around $72 including delivery. Stealerships wanted over $550 for the starter alone and total replacement charge of nearly $1100. Starter started going bad at just over 100k miles. If yours needs replacing, don't get discouraged. Look at the vids and get to it. Just need to be careful and have some muscle!