I only had 2k miles on my car when I changed mine out, but I can tell you that for the demon bolt you are doing the right thing with the pb blaster... I would actually use it several times that night or over the course of several days to really get it in those threads. I bought a 20" and 10" 1/2 extension with the 14 mm socket... I bought the impact socket, but wound up using the standard (all Kobalt tools by the way). I then removed the intake hosing and even the strut brace. You don't need a universal... just have someone under the car to guide the socket onto a SIX STAR SOCKET!!! Very key there... NO 12's!! and then have your half inch wrench and apply pressure... you can use a breaker bar... but sometimes slow steady pressure is better to get the bolt to break loose... have a friend put his hands on the wrench as well and just increase pressure slowly.
The extensions are at a diagonal angle.. but it fits right up flush to the bolt, as it is at the exact same angle ... so it works out pretty well. Just keep soaking that bolt, even if you are going to take the car out for a ride... soak it all over, it will help to remove some rust if any is present as well.
Hope this helps.
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