Could be that or just a leak at the rear pan rail...
Nope our motors don't have pressurised Main seals and if the PCV system is functioning correctly you should have a mild vaccum in the crankcase.
Dub: Glad I did ;)
(The 340 has an over pressure bypass in case the cooler is blocked but I would have been scratching my head why it was running so hot)
Interesting warning on the Toyota Type I-V Oil can "Prolonged contact with skin causes cancer in animals" :)
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