So, since it started knocking we can rule out the sending or gauge. Not being a fan of coincidence, what could have transpired during an oil change that would lead to the regulator failure? I really can't imagine the pickup creating that kind of eratic symptoms, but maybe. I don't guess some contaniment was introduced to the oil during the change that kept "lodging" and impeding oil flow then coming loose and allow pressure to get back up to norm and now finally has stopped flow all together.
Be interesting to know the cause but many times they will just fix it by replacing parts and not seek the cause.
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