I wouldn't change to synthetic mainly for fear the seals would start leaking. I could see advantages though especially to reduce wear from a dry start, but that may be more theory than practicality.
I believe in keeping consistant with oil brand and type. That is why I continue to use 15-40 in my Lehman becuase the previous owners used that.
Funny that many become really passionate about oil brand when in fact there are few failures that are oil brand related.
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