I have found a possible donor car, but the guy says it's had low oil pressure for ever. At idle it goes to 0 and a little throttle it comes right up. Does this mean the lower end is near the END?

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1984 280SEL, 62,000 miles
Euro model in the USA
1983 300D (Totaled out 10/2004)
New Factory Mint Green paint
Palomino int
1982 240D (Steak dinner for two)