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13. An older engine that uses flat-bottom lifters should have an adequate amount/number of in its oil or oil-additive. A. viscosity B. ZDDP (zinc) C. diesters D. polyalpholefin (POA)
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43 votes
43 votes
13. An older engine that uses flat-bottom lifters should have an

adequate amount/number of in its oil or oil-additive.
A. viscosity
B. ZDDP (zinc)
C. diesters
D. polyalpholefin (POA)

User Dmytro Mysak
by
2.8k points

1 Answer

21 votes
21 votes

Answer:b ZDDP (zinc)

Explanation:Most engine and engine component manufacturers recommend zinc and phosphorus content of more than 1,200 PPM for break-in; in fact, many will void warranties on camshafts or crate engines if this minimum is not found in the oil sample you supply when returning broken parts for warranty.

User Dsdel
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2.7k points
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