Does it matter what grade of oil I use? Specifically, is a lighter weight oil better for the job? I only have 20w50 on hand...Thanks!
I look at soaking lifters is oil like soaking brake calipers in brake fluid. You will not get any of the air out by doing that, no matter how long you leave them soak. You must force fluid thru the part to get the air out.
But, you are not harming anything and if it makes you feel warm and fuzzy have at it.