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I'm fine discussing this although not an expert on this specific aspect of the Prius. The motor is either a 1.5 or 1.8l 4 cylinder that's also used on a number of gas-only Toyotas, Scions, etc. Therefore, any leak sealant that would work on such a motor could work. I'd look around on Priuschat.com. One person used it and had a catastrophic failure (total engine loss) several months later. This may have been caused by hydro-locking and if you've had any hard starts, you've probably hydro-locked yours and maybe bent a connecting rod. Then, it might be only a matter of time before total failure, regardless of how you stop the leak.

Don Hiebert
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