I think it is a 2.5 horsepower engine. There are 4 oil formulas for Kawasaki lawnmower engines. I recommend you use the correct blend as stated in your owner's manual.
Yes, that is called a blend.
Yes you can use a synthetic blend or 100% synthetic.
Yes, you can. It is even sold as a Synthetic Blend.
I assume you mean synthetic. Use exactly what the manufacture recommends in your owners manual. I they recommend synthetic then use 100% synthetic and do not use a blend.
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.
You can blend synthetic ATF with conventional ATF.
You can use synthetic, synthetic blend, or conventional oil. It is your choice.
I was looking at the 2006 Lincoln LS Owner Guide and it shows : Use of synthetic or synthetic blend engine oil is not mandatory
You can use conventions, synthetic blend, or 100% synthetic, your choice.
Valvoline 10W-30 Synthetic Blend
The engine uses 5W20. It can be synthetic, conventional, or a blend.
5W-30 try a synthetic blend since your car is newer ***Synthetic blend is not necessary in this engine, and the only benefit that you will see from the use of synthetic fluid is the ability to go longer in between oil changes. Due to the cost of synthetic oil, the existence of little or any benefit is arguable. Use, at the most, a synthetic-blended 5W-30 engine oil.