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There is one other unlikely possibility. There is an oil pressure relief valve in the block that uses a simple spring that is pushing against oil pressure. When it gets too high (high rpm cold oil, etc), this valve opens to compensate. It's a cinch to replace and Cdan has them in stock (I have 3 of them from a year ago). I think it would take about 5 minutes as it's a single screw holding it in and it comes straight out of the block.
However, FIRST THING I'd do IMMEDIATELY is change the oil and filter even if it's only a week old. May have a defective filter or you'll discover shavings in the oil, etc. First thing. Would not even drive it until I was sure the engine was getting fresh oil - then I'd work on sender, etc.
DougM
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'93 FZJ since new, 2.2kw starter, Revo 275s (Michelin Alpins in winter), locked, big Hellas, rr fog, rr flood, rr Airlift, synthetics, ARB bullbar. 97 FZJ - exact same stuff but Michelin X-Ice in winter.
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