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    '08 Corolla noticable varnish after Castrol GTX

    160,000 miles mostly 4k OCI w/ 5w30 dino (typically Chevron Supreme, Mobil 5000 or Formula Shell) and FRAM orange can filters.... but last couple years i started to use more synthetic oils with better filters and longer OCI... car runs great on everything... 90% highway miles last few years...
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