I see the big plus of synth. oils in my air cooled motors, IE bike, lawn
tractor, etc. .
Oil looks cleaner at 3k on synth. than dino does. Book says 5k change, I'd
never go that far with dino as it looks black as hell at 3k where as the
synth. gets dark at 5k.
Lawn tractor oil, (no filter) looks good after a summer's worth of mowing vs
dino needing a mid summer change with black oil showing.
Just did a lower manifold gasket change on my '02 Malibu, it's been on a 5k
sched. and at 100k zero sludge and only slight brown tint on the inards.
It's been on a diet of Wally world oil and Purolater Pure One filters.
Did the manifold gaskets on my '99 Yukon at 80k and motor looked the same
except it gets Mobil 1 oil. M 1 is in the Yuk as it gets run harder with tow
If it runs hot or gets run hard pour in the synth. oil, normal use use
regular oils. Use top rated filters.
That's my 2 ........