Of course, these oil changes & valve adjustments are relative to the life expectancy of the engine. I think (hope) Jims 600 hr est is conservative, my oil ch schedule exceeds OEM specs, I am ballparking the depreciation factor to 900 hrs @ 150 hrs per year = 6 years.
The 4th-century Tomb of the Lionesses consists of a small chamber with gabled roof. The painting depicts flying birds and dolphins and scenes from the life of the Etruscan aristocracy. The 6th-century Tomb of the Hunting Pavilion shows the view seen through the transparent fabric of the pavilion.
National Archeological Museum that also organizes visits to the Etruscan tombs. Address: Via Porsenna, 17 (CHIUSI) Also, not far from Siena, the Etruscans had the city-state of Volaterrae, which is now known as Volterra. An excellent Etruscan museum can be visited there. Museo Etrusco Guarnacci: There are 600 funerary urns on exhibit here, in addition to many other fascinating exhibits of local Etruscan finds.