To summarize my initial conclusions:
• The Norton Commando
is capable under extreme riding conditions of experiencing
engine temperatures that can cause rapid breakdown of commonly used oils.
• The only place on the engine where such extreme temperatures can occur is the
• The condition most likely to create oil-destroying temperature is reduced airflow over
the cylinder head, especially following or combined with high-speed or uphill riding.
• All oils are not equal and some differ greatly from the norm in their maximum