you mean a lawn mower right.. if so no
Yes, you can. It is even sold as a Synthetic Blend.
10w-30 either synthetic or regular Castrol for regular or Mobil 1 for synthetic
If you have kept regular oil changes, no prep is required. Just go and put the synthetic oil in.
if it's a turbo engine you should only use synthetic oil only!! if it's a non-turbo engine a conven. oil will do.
No it is fine to switch back to regular oil.
They can be mixed.
Dermatitis? Engine oils are for engines not your skin.
Regular oil is recommended by Jeep. Edit: Correct, Jeep does not make a recomendation to use synthetic oil. However synthetic oil will not hurt the engine at all. The recommended weight is 5w30.
It would not be as good as all synthetic however mixing the two should not do any damage to your engine.
Well, the best oil is either Mobile 1 or Castrol FULL SYNTHETIC OIL... 5W-30 or if you have higher miles 10W-40... PLEASE MAKE SURE YOU USE SYNTHETIC, this is what VW/Audi uses from factory on all their engines... Contrary to what many people say... YOU CAN NOT use regular oil on a car that has had Synthetic oil... it is almost like mixing water into oil... due to the synthetic oil creates a barrier in you engine to help protect it longer... if you put regular oil in an engine running Synthetic, this will cause EXTREME Engine Sludge Buildup... causing the engine to not operate correclty and costly repairs to the engine...
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 use Synthetic oil at any time. You can even mix it with regular oil. Just be sure and use the correct weight.