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Newer engines, such as the 4.6L SOHC and DOHC V-8 found in '96-'10 Mustangs, consist of different kinds of metals than we find in the old classics. For example, these engines don't use tri-metal main and rod bearings. They use aluminum bearings to save weight, improve oil control, and tolerate tighter clearances. Also, 4.6 timing chain tensioners consist of nylon, which will show up in oil analysis when wear is excessive.