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.
Archaeologists help reconstruct the past in other ways besides simply excavating sites belonging to a particular culture. Eth-noarchaeologists study people living today and record how they organize and use objects. The study of modern behavior can help reveal how and why people in the past left behind certain types of remains in certain patterns. Environmental archaeologists help us understand the conditions that existed when the people being studied were alive. Experimental archaeologists reconstruct techniques and processes used in the past to create artifacts, art, and architecture. Underwater archaeologists study material remains that survive underwa-