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That's correct, they are -10 fittings on the thermostat. Also keep in mind that if there is some oil on the threads when the fittings are tightened down, then some oil will weep out the hole on the fitting shortly after install. But if oil is still weeping out after wiping it off, then that could mean that there's a problem with the fitting either not being tight enough, or damage to the fitting.
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