Oil dilution is no longer necessary if you are using 15w-50. Since the oil changes its viscosity; so it's thinner during the start and thicker when hot -- something they didn't have in 1968.
But, if you really want to limit the wear on the cylinders during start then you must use AVBLEND. There's nothing better then synthetic oil and AVBLEND -- and you should be able to fly the eninges 2000+ hrs.
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