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Mine looked like it had Rectorseal #5. yellow and hard. It was actually a recommended sealant decades ago for gas, oil, water, diesel, hydraulic fluid, natural gas, etc.

last one........we can ignore mis fueling for the multifuel, but some injector cleaners may not provide lubrication. https://blog.motoringassist.com/car-maintenance/prolonging-diesel-injection-pump-life/

this one is good too, especially toward the end when talking about additives and fuel "gel". https://www.petrolplaza.com/knowledge/1982

good reading.......https://www.fuelexpert.co.za/2-stroke-oil-in-diesel-technical-study.php