3.9 v6 mustang running different oil 520 to 530

Asked by Jun 07, 2017 at 02:34 AM about the 2004 Ford Mustang Base

Question type: Maintenance & Repair

Iv got a v6 04 mustang that i take very good care of
its only got 46.000 on it i desided to stop using the
5 20 cuz i fill its just helping. Mpg and doing more
wear on the motor. So i went to 530. And only use
Mobil one. I know it prob sounds stupied but i just
want the motor to last way past when it becomes a
classic.

Will this hurt it in any way people that know about
the 3.9s would be very helpful

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