Seafoam and Lucas addiitve are very different.
Lucas additive can overwhelm your antifoaming additive.Foam is a bad lubricant.
Dont use it.
Seafoam is ok to use, the week before an oil chnage, you can use it longer but it just evaporates and teh varnish it picked up just redeposits so If I ever use it I put it in 4-5 days before oil change.
Fred...
