Should hybrid owners use a special fuel additive? David Kaiser of LIQUI MOLY says "Yes"

Porsche Cayenne plug-in hybrid crossover. Photo: Porsche Newsroom.

If you drive a hybrid, should you be worried about the health of its internal-combustion “backup engine?”

David Kaiser, head of research and development at LIQUI MOLY, an automotive lubricant and additive manufacturing company based in Germany, says you should.