I noticed that it smelled sort of like burning plastic, as soon as I fired up the first tankful.
But as I was mainly using it in the weedbeater and not trying to keep the wind at my back
the way the leaf blower needs ( lot of willow oak leaves here)
It took a while to get caught in a really light tailwind with the blower.
I had always figured the mild headache and twinge of nausea was just me not tolerating the heat and humidity worth a crap and just was simply getting worse with age.
Upon getting in a light, slow tailwind while running the backpack blower, I had a few times of being in vortex full of the exhaust plume (those willow leaves again).
When It made me stop and go take a (rather pricey) migraine tablet on a couple of occasions,
I started asking myself some hard questions about what else was different, besides the number of candles on my birthday cakes.
Switched over to the Red Armor oil and headaches & nausea went away after a running things long enough to purge the crankcases, ring groves & mufflers.
Figured that was simple enough of an answer.
edit: to add mower comments.
While questioning things I also realized that 3~4.5 hrs of running the push mower alone, in the worst heat, didn't make me feel anywhere near as sick. Yet 25~30 mins of pre-mow cleanup
of the early season leaves using the blower did.
I ran the oil for most of the summer (stubbornness. What can I say..).
Got to always look at ALL of the correlated factors, when troubleshooting a situation.
And that needs to include myself. Both mind and body.
