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If you have leaky engine oil seals, the at minimum you should be sure to regularly check your oil level to avoid damage to the engine for lack of oil.

However, even with slow leaks there is good reason to repair them. Often, oil leaks are a result of seals that have gotten hard with age. These hardened seals tend to wear a groove into the sealing surface, which increases the likelihood that the metal sealing surface will need to be repaired as well.

An additional concern is that adjacent rubber components like coolant hoses and suspension bushings will be damaged and significantly weakened by exposure to the oil.

These weakened coolant hoses tend to bloat and eventually become much more likely to split under pressure from the cooling system and invite damage to the engine from loss of coolant. On a personal note, when I was a kid I had engine that was leaking oil and I ended up having to overhaul it because I didn’t stay on top of it closely enough. Later on, I had another oil-leaker that I was “staying on top of” till I lent it out to a friend for an extended period while I was out of the country. This engine ran out of oil and had to be rebuilt as well. Oh well, live and learn