Think you're going back a few decades... ;-)
But even then, my SD1 has a US designed engine from the 60s. Oil changes every year or 10,000 miles, so no different from UK engines of the time. And it is also pretty decent MPG wise compared to similar sized UK designs.
- ?Toyota Super Long Life Coolant?
- Similar high-quality ethylene glycol-based nonsilicate, non-amine, non-nitrite, and non-borate coolant with long-life hybrid organic acid technology"
which sounds like normal coolant on modern cars to me.
I'm not surprised that the cooling systems for the engine and battery on a PHEV are separate though: 'cool' for the engine is 'damangingly hot' for the battery. Although I could imagine a heat exchanger to warm up the battery in cold climates, it's probably easier to have a little electric heat.
Theo
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