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1 .Material: There are 7 types of material used for oil seals, they are.
What are Oil Seals and how should they be ordered?

ls1 spark plug wires.
Check the faces of the head and block for flatness. Alloy heads in particular can distort and then leak.
MH: O.D. wall is a rubber material
HM: O.D. wall is a metal case
MH(S)H: O.D. wall is metal with a reinforced inner metal case
Ethylen-Propylen-Dien-Kautschuk (EPDM)
Use the right assembly tools
With spring type Secures stable sealing performance.
In this an auxiliary lip is provided along with the regular sealing lip. The additional dust lip protects the main sealing lip against dust and other fine solid contaminants and therefore this type is recommended for use in polluted environments. To achieve a long lifetime a suitable lubricant between the two sealing lips should be applied.