Are ya'll sticking with synthetic oil?

did valve cover job on my bmw 130K, syn since day one, the cover have no sludge, looks very clean. actually my miata w/ 150K on reg. oil it is also very clean, the thing is just follow what mfg request, and change between 5-6K you should be fine, Syn can go longer but I tend to change it before 8K..
 
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