Yes. The only downside to running synthetics is a potential for old engine seals starting to leak due to varnish build-up being removed by the synthetic oil additives. Other than that, you can swap to synthetic oil without any problems with the engine.
Yes you can change to conventional oil.
5k with Mineral or 7.5k with synthetic.
Basically no Adding mineral to synthetic oils destroys the characteristics of the oil. Adding synthetic to mineral is waste of the more expensive synthetic oil with the same results as above. If you have to mix in emergency, get a complete oil change ASAP. You can use either mineral or synthetic oil for the same application but not mixed. Synthetic oils in cars is now used as it gives longer service intervals- typically 12 months or 12,000 - 20,000 miles. Mineral oils break down quicker and require changing more frequently 6 months or 6,000 - 10,000 miles
Sure. But never mix the two. If the crankcase has synthetic in it, only top it up with synthetic, and vice-versa.
depends on the oil you use, recommended for mineral 5000km for synthetic 10000km
Eaton-Fuller recommends either 50W synthetic or 80 weight mineral oil.
Most oil is natural, especially if it is not mineral oil. However it is possible to make a synthetic oil.
I will change my oil from conventional oil to synthetic oil on my next oil change.
It is conventional oil and contains no synthetic oil. 3000 & 5000 are part synthetic and part conventional. 7000 is a full synthetic oil.
From what I have been able to research most manufacturers recommend using 10W-40. You should change oil every 500 to 800 miles. And it is better to use a synthetic oil versus a mineral oil, eg; Mobil 1 synthetic, as synthetic oil does not create the sludge that is prominent with standard petroleum based mineral oil. Hope this information is helpful.
Yes. I change mine every 3,000 miles. 5W 30 Genuine Mazda Mineral Oil (non-synthetic) is recommended.
Yes you can. However, I do not see a reason to do that.