I have a cousin that works at Exxon/Mobile headquarters in VA. After speaking with their engineer, they say that Mobile1 "should" be fine although they have not finished testing it. He was also concerned with noise and long-term wear characteristics on the tension surface on the timing assembly, but upon initial testing results, he said it should not cause harm or reduce reliability.
On the alternative, there is Motul Ester available as well. We have used this oil for both racing and street applications without issues.
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