Surely it's low oil pressure initally...but it shouldn't be related at all to changing that seal.
Has the oil been changed reguarly in this car? How about lately?
If not change oil&filter, and while you're down there check the bottom of the oil pan for dents! The oil pickup in these are located very low and if the pan gets dented even slightly it can block the pickup, resulting in low pressure.
It also could be that the screen is just clogged with sludge from not changing oil reguarly.
Lastly, could be the oil pump itself wearing out...although it's rare to have happen. I've been working exclusively on Honda Accords for the past 12 years and haven't seen a bad oil pump yet, but wouldn't rule it out.
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