Big Caliber
New member
Is there anything bad about using a little 5-20 Valvoline conventional oil to clean out a bore in addition to Hoppe's 9???
Well, the dry patch came out dirty with carbon even though the I cleaned (or thought I cleaned) the bore thoroughly.
An old trick I used as a auto mechanic. When your hand were really nasty with grease I would put some clean oil in my hands and rub it in. Worked real well to loosen and remove heavy deposits of grease and grime then followed up with soap and waterEngine oils have cleaning/dispersing properties to shed carbon and other contaminants from the moving parts into solution- as well as lubricating ones...
I don't use motor oil (and rarely Hoppe's, either), but I suspect that the motor oil could loosen deposits that were not dissolved initially by the Hoppe's