ive been told that after putting synthetic oil in my car i would have to keep synthetics in it
It's okay to use Synthetic oil on any vehicle but bare in mind, if your vehicle has previously run on regular oil you will need to drain all the oil out completely in order to switch to synthetic, once you run on synthetic oil though you have to keep the oil synthetic because switching between different types of oil will really mess up your vehicle.
It is always best to use the oil recommended by your vehicle manufacture. If you are considering the difference between Synthetic oil and Conventional (pumped from the ground); if your owner's manual says to use synthetic, you need to use synthetic. But if your engine was designed around conventional, then you can upgrade to synthetic. Synthetic has advantages as being better at cleaning and protection your engine, but if you have a higher mileage vehicle, synthetic can cause leakage of the gaskets and oil seals.
Use the manufacturer's suggested oil. If you have a turbo charged vehicle, synthetic oil will make it run cooler.
Depends on what vehicle you are putting it in which you do not list.
5W-30. Remember, do not use synthetic oil if your vehicle is above 75,000 miles and has not had synthetic oil used before.
Synthetic works really well but is more expensive. Also, if you start using synthetic oil, you need to continue to use it and avoid mixing the two types of oil. If you are not sure you could keep on with the synthetic, then use traditional. In any case, get your oil changed regularly.
I would use the basic oil; However if your vehicle has high mileages, I would recommend synthetic oil by Mobil 1.
You should use the oil recommended in the owners manual. If you don't have one, get one from MOTORLIT.COM. No. The use, or not, of synthetic oil is completely up to you as the owner of the vehicle, and has no effect, good or bad, on your vehicle's warranty. Warranty terms cannot compel you to use specific brands or types of oil, only the viscosity(5W30, 10W30, etc.).
Unless you are driving in extremely cold or hot conditions conventional oil is all you need to use. The exception is any air cooled engine where synthetic is of benefit, or if the manufacture recommends you use synthetic. Also if the vehicle is used to tow heavy loads.
The oil you use in a four-wheeler is exactly the same as you use in a vehicle. If your four-wheeler is air cooled I highly recommend you use a 100% Synthetic oil in SAE 10w30 weight. If it is water cooled use either Synthetic or Conventional oil.
No, old oil can use synthetic engines
yes you can use synthetic oil if you want to