I've used JG Lubricants (commercial member here). Takes about a week. Yes, there is a value in doing them even if only once as it can spot high values in wear (bearings, cams, silicon, etc) which can help make an informed decision on engine/transmission condition.
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2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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