Quote:
Originally Posted by RalphInCA
Use whatever you want.
The worst we have today is worlds better than anything they had in 1947.
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A lot of great observations here. This one sums it up for me. Have heard about the increased leakage concern. I do believe it reduces engine wear in any engine and that's the decider for me. I'd like to see my flathead last the rest of my life without needing a rebuild. For my next oil change I'm going to use synthetic. I'll use whatever's closest to the original viscosity recommendation though, nothing thinner.
I know, flathead guys don't need no stinking torque wrench, but over the years, I've see a lot oil pan drain plugs stripped when torqued "by feel." Any thoughts on a reasonable torque value to prevent weepage AND protect thread integrity?