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I want to protect my investment

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then buy a reasonably priced oil and change it more often using a quality filter. imho none of these "boutique" oils is magic and they all get dirty regardless

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I use the standard old Valvoline 5W20 WT non synthetic in all of my custom built motors that are N/A. I have used the new 25W40 (or maybe it is 25W50WT) Pennzoil racing oil in one customers N/A pump gas street Hemi, he wanted the good, trick stuff That oil does feel different when squeezing it in between my fingers, it is a lot slicker feeling than any of the other oils I have treid that with A freind of mine that builds very succesful road race motors(45 minute heat races)turned me onto this new Pennzoil race oil There oil temps can get upto or above 240F they do change it regulary after every race and send in samples for oil checks