For those that might use KROIL for guns or to change sparkplugs on a 2004 F-150 (without stripping the head) I found a good offer. Two 13oz spray cans for $12 with FREE S&H. I was actually looking for the 8oz liquid in cans, but this is quite a bit more for less. Don't know how long the deal will last - expiration date not posted.
Then go to the WEB Order Page. Lots of products but this deal is near the top of the list, in Red font. Where is asks company (required) just type 'none'. Make sure bottom line has 'Google Deal' or 'Google Offer' filled in (should be there already). Note: you will not get a numbered receipt page, just a Thank You for purchase. Ordered mine on 27Aug. Received today.