This is an answer that I received after contacting Amsoil Synthetic Technician with a question on when and at what hours can I switch for dino oil to Amsoil heavy duty diesel oil in my new tractor. Hope this helps answer any questions about a long break-in period befor switching to a synthetic based oil.
DevilDog
Rick;
The AMSOIL 0W30 oil is a gasoline engine oil, therefore is not as good a choice for use in diesel engines. It is recommended for use in almost all gasoline engines, however. My suggestion is AMSOIL 5W3.0 Heavy Duty Diesel Oil (HDD) in your climate. It can be used after accumulating only 6 hours on the engine.
Thank you for this opportunity to respond to your question(s). As always, please feel free to contact us again if we can be of further assistance.
Sincerely,
Byron Selbrede
Technical Services
The accuracy of this e-mail response is dependent upon the information provided. AMSOIL INC. is not responsible for wrong recommendations that were based on inaccurate or incomplete information.