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my (bmw only) mechanic hears this and says "i bet if you look thru the records you'll find they've been using synthetic oil". i knew he was right because the owner told me so - all records showed mobil one.
his suggestion was to replace it with valvoline synthetic blend 20w-50, providing more viscosity. no ticks since, although i must add that i did use the oppty. to also add slick 50 (i know, but that's a different thread), and inflate the tires to 44/40psi.
as he promised, it's now a different (and even better) car.