Re: Oil change interval for synthetic oil

["FRED E THOMAS" <frede.thomas2@verizon.net>]

> As I recall, when Mobil 1 was first sold, changing the oil was not 
> required,
> just a filter replacement at some mileage interval and toping off the oil 
> level.
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This is the same with diesel locomotives, they change the filters on a 
regular basis, the oil only after many 1,000's of hours. "FT"