yes it is fine but of course synthetic is the best to use if you can.
Double check your oil requirements with your owner's manual. If it states that normal oil is okay, then go ahead. If your owner's manual dictates Synthetics, then DO NOT switch.
synthetic to conventional - ok conventional to synthetic - no
That's okay.
Yes, and you can even mix them together.
i'd say its better. you might get leaks, because regular oil has bigger molecules than symthetic. i run synthetic in my truck with 193,000 miles all the time no trouble
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.
The switch could be bad at the passenger seat. The switch could be bad at the passenger seat.
It is always okay to switch between regular and premium gasoline. With that said, it depends highly on the make of your engine whether or not your car will actually benefit at all from the use of premium gasoline. Make sure to look in your car's manual before you switch to see if your car can benefit for from the switch.
3.5 Qts of Regular 5W-30 will do just fine. SAE or Synthetic is okay. However, i recommend Castrol EDGE 5W-30 Synthetic and a Purolator ONE filter. -Evil Tim TX226
Yes, just make sure it is a diesel rated oil. There are varying opinions on how long you should wait for the engine to break in first. 10,000 or 15,000 miles is probably safe. 5w40 is the commonly used synthetic diesel oil.
It is typically okay to use synthetic ATF to top off a transmission originally filled with conventional ATF, or to replace conventional ATF in a transmission. However, you should always check with the manufacturer of the synthetic ATF you want to use if it is compatible with conventional fluids, and if it meets the requirements for your application.
yes
It won't take. Synthetic hair is made from acrylic or plastic.