Reddit mentions of Dow Corning Molykote 33 Light Grease Lubricant 5.3oz 150g Tube

If anything you have says food grade, you're most likely set.

This stuff is the best, and it'll last you forever..

http://www.amazon.com/Dow-Corning-Molykote-Grease-Lubricant/dp/B0141NIS8M

This stuff also works, but washes away more quickly.

http://www.amazon.com/McGlaughlin-Oil-Petrol-Gel-Lubricant-4oz/dp/B01G5Y9Y7E

It's for sure expensive for so seemingly few applications, but you can really use this stuff everywhere. Doorknobs, squeaky hinges, tools, bicycles, etc...

As for the frequency of cleaning...

Since you are all stainless, it makes cleaning frequency kind of a contentious topic... The Brewer's Association currently advocates for every two weeks, but through commercial applications to hobby level, with stainless/vinyl contact, up to a four week interval can be permissible.. Especially on a direct draw system such as yours.

What would probably be most convenient, would be to clean every keg change using a little hand pump bottle like this:

http://www.micromatic.com/beer-line-cleaning-kits-and-equipment/deluxe-beer-line-cleaning-ck-1100

Super easy to use.. Remove the faucet and coupler, pack the lines with the cleaning solution and soak for 45 minutes. Use the leftover chemical from the soak to brush the faucets and couplers clean.. Rinse, reassemble, and your done.

You do have another option...

Some people opt to never clean, and instead just replace the length of line every few months. The coupler and faucets would still need to soaked and brushed, but using John Guest (push-to-connect) terminations, changing lines becomes fairly trivial.

A $25 dollar 100ft roll of barrier tubing would last you several replacements, and it will remain cleaner longer. The big drawback with barrier is that it more susceptible to kinking than vinyl is.. But it is better for the beer, and perfectly suited to your application. And you won't need any overpriced, questionable quality cleaning equipment... Just unplug the line, coil it up, and soak it.

https://www.freshwatersystems.com/p-2502-john-guest-female-adapter-bspp-516-x-58-bspp.aspx

These fittings would attach to your couplers and and shanks, and just as before, you would use ~6ft of 3/16" ID barrier to get about 12psi of restriction. I don't know this website, but Accuflex's Bevlex 235 is the stuff I'd recommend.

http://www.birdmanbrewing.com/accuflex-bev-seal-ultra-barrier-tubing-3-16-id-100ft-free-shipping/?gclid=CIDbk8OPj80CFUpahgodKNYITA

What's also cool about using a quick connect line, is that it simplifies pouring a larger range of carbonation levels and styles.

Say you want to put something on with a higher volume of Co2, let's say 3.0 v/v... To maintain carbonation at 38º, now you need you set your gauge to 17 psi. Your flow rate will now cause turbulent pouring since you only have ~12 psi of restriction.. A net 5 psi positive pressure will pour too fast. How can we fix it?

Just plug in a 8' length of line instead of 6', and you've balanced out the system.

Or maybe you have a barleywine or stout that you don't want to drink at 38ºF... At 2.5 v/v and 38ºF, you need about 12 psi of straight Co2. That same beer stored at 50ºF would need 18 psi to maintain 2.5 v/v, or it would de-gas and foam like crazy. With that badass controller you bought, adjusting the serving temperature is an option available to you.

You might be seeing flow control (restrictor) style faucets more prevalent these days.. As beer styles come out with greater ranges of carbonation, bars and restaurants can't just hack their system open to add/subtract a few feet of line, but the system still requires the restriction be dialed in to operate efficiently. So they restrict at the faucets because they can't restrict at the lines. Pretty neat..

Junky establishments won't care sometimes, and will potentially let the beer go flat using a lower (incorrect) pressure to get more manageable flow rate... Basically saying F you to the people that worked hard to make it. It's whack.

Enjoy your setup... I get super excited seeing people do this stuff right! That setup you built is going to make some people very happy.

Check the manual and parts guide and get some Dow 33 grease. And the maintenance is easy. There's YouTube videos on it. Basically just clean and re-grease the o-rings between each day of play.

As others have said just go with DOW 33......you can find a giant tube of it on Amazon under Dow Corning Molykote 33. Or this link : http://www.amazon.com/Dow-Corning-Molykote-Grease-Lubricant/dp/B0141NIS8M/ref=sr_1_fkmr1_2?ie=UTF8&qid=1450356580&sr=8-2-fkmr1&keywords=dow+33+mo

I shoot and tech the vanquishes and luxes for my team and bought a single tube of this 2+ yrs ago and I still have a ton left.