personally, when a car starts getting a higher amount of miles, and never had that kind of solvent cleaning before, it's best not to do it now.
Some of the buildup in the motor might actually be beneficial to the longevity of your oil pressure and bearing surfaces. If you effectively clean out the motor, you send larger bits of debris thru the system and also increase the working clearances on the bearing journals, which may cause an oil pressure drop after such a cleaning.
I vote don't do it.
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