Motor oil as well as other lubricants made from crude have many different sized molecules.
Premium Amsoil Synthetic, typically made from natural gas, has molecules all the same size.
When heated the former tends to evaporate off its smaller molecules and leave a sludge coating. Amsoil Synthetic has the opposite effect. It gradually removes sludge.
If conventional oil has been used for over 30,000 miles it might be best to do Amsoil Engine Flush when converting to Amsoil Synthetics.
Feel free to contact me or call Amsoil’s Free Tech Support (715) 399-8324 9am-6pm workdays to discuss your particular situation.
Steve Dawes T-1 Certified Direct Jobber, Amsoil