What are you saying KC, it's better to leave the sludge in there.
While it is true that detergent oils will start to clean things in the motor, it is not going to happen overnight,nor would it be like putting a solvent in the motor.
The clean up inside the motor will be slow and I have not experienced a problem running detergent in place of a non-detergent oil.
Aside from that, today it's not easy to find non-detergent oil, so what's left to run in it......detergent oil.
I would run a straight weight oil like 30w or 20w. I don't know about your area but straight weight oil is getting hard to locate on the shelf also.
A multi-vis oil like 10w-30 is a little thin to run in some old motors because of the greater tolerances and wear.
I'm not saying you can't run a 10w-30, but I think a heavier viscosity oil would be better.
Dan
