I am sorry to hear this. I can only imagine how that effects all the aspects of your life.

I had no idea how synthetic oil could create the problem you are having with the car, but now understand your reasoning.

Good luck with the knee replacement. I tell people the surgeons and their team will work the magic, but the physical therapists are the ones that will give you your life back if you are willing to do what they say.
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Any twenty minute job is just a broken bolt away from a three day ordeal