hi guys i am switching to all royal purple oils is it just drain and fill or is there a method to switching to synthetics i have a 04 5.3 4x4 i plan on switching all fluids. also are the e3 plugs able to be gapped it dosent seem so . thanks.

It's just a drain old oil and fill with new oil method, I think it even says so on the back of the bottle.

what about the plugs anyone had experience with these e3 it dosent seem like they can be gaped

This is not a site I would normally think of for seeking advice concerning spark plugs.

This is not a site I would normally think of for seeking advice concerning spark plugs.

Me neither...

But no, I have never gapped e3 plugs in my lawnmowers, weed eater.

Who knows what I am going to put in the Tahoe when I get motivated...