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.
They were perfect pets-playful, intelligent, affectionate and helpful to the farmers who sustained life in ancient Egypt. Tomb paintings with cats as part of family life began to show up during the New Kingdom-about 500 years after the first attempts at domestication. But the most direct evidence for domestication comes from cemeteries of mummified cats. These appear to be from around 1000 B.C. (the late Pharonic era).