Here's something one can do easily at home,,,,
DISCLAIMER: 20W-50 used in my prior air-cooled Yami
Take your favorite flavor of full syn and the exact same flavor onlyin semi-syn,,,
Pour one at a timein a funnel veeery slowly, just fast enough not to drip,,,
(Pour to the side of the funnel, not dead center)
Watch each one as it 'flows' down the funnel neck,,
One flows right down without any noticable effect in the stream,,, The other 'clumps' kinda like syrup poured slowly over pancakes,,,
Same brand, same weight, just syn vs semi,,,,
Lotsa clearance in most air cooled engines,,, The Yami 1900 was pretty picky about oil,, and how much engine noise you could expect from different types of oil,,, Full syn was noisy, and semi kept its 'quiet' longer than Dino.
We could also discuss using the recommended TBN instead of something less to to help keep your shared-sump oil (additives) from shearing as quickly,,,,,,,
NAH!!!!!!!!!!!!
LOL! The syrup test is a lot more fun!!!!
=)