Re: oil
I agree will almost all of this except "whatever weight, type, e.g., detergent or non-detergent". The one thing I would never recommend is running non-detergent oil. I have seen the effect, and heard lots of others who have experienced the sludge effect of Non-detergent oil.
As for the rest of it when it starts looking dirty, change the oil, whatever oil you decide to use. I have my preference, but it is based on reasonable cost, and is available everywhere.
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