No, as long as it is the proper weight.
In fact I highly recommend synthetic oil be used in any air cooled engine.
Yes, many believe that you can not mix any oil blend together. This is not true, full synthetic can be mixed with conventional also with no harm. If this is done, there is just wasted cash when buying the synthetic.
yes it does.
Fully synthetic transmission oil most likely exceeds the OEM fluid. Make sure the synthetic is compatible with your OEM requirements and that the syn fluid has any modifiers required or you may need to add the modifier separately. Same applies to the differential, you may need modifiers (additives) for limited slip type rear ends.
No, you can even mix synthetic with conventional oil. It will do no harm at all.
No - in fact, your engine might just appreciate it!
Yes. It wont harm anything on the car.
No. It will ruin an engine. The above answer is 100% wrong. You can mix convention oil with synthetic and it will do no harm at all. When you see them selling Synthetic blend that is what you are buying. A blend of synthetic and conventional oil.
I use synthetic fertilizers and my yard is full of earthworms and grows really well. So my answer would be no.
Yes, there is no harm in switching back and forth.
Synthetic fertilizers when washed away leave salts and other trace minerals behind. Some of these minerals bond to plant roots eventually clogging them up.
run 80w90 non syn. in that tranny... run an additive if you want
no..what harm can a color do to you?! Improving on this answer requires an improved question...do you mean synthetic colour or animal based dye?