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Does the oil in the hpop need to be changed when changing the oil in the engine too? I thought the oil in the hpop reservoir was circulated from the engine, or is a closed loop?
Does the oil in the hpop need to be changed when changing the oil in the engine too? I thought the oil in the hpop reservoir was circulated from the engine, or is a closed loop?
It's all the same oil. Some change the HPOP oil some don't. It's a personal choice. There is another couple of qts in the heads that doesn't drain so the qt in the HPOP isn't much. Your choice.
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