yeah it says to only put it in your crankcase for like 300-500 miles as it does thin it out...i changed mine after like 2 but i just let my car idle while it sucked it up the booster line...it'll stall if you submerge it all the way...just let it hover over a little cup or something....i put about 5oz of it through there.....so here's a recap

1. Remove the brake booster line and let the car idle while sucking up approx 5oz or so. Shut car off. Let it sit for like 15-20 mins.

2. (optional) dump about 3-4oz in your crankcase...if you do this change your oil after a couple hundred miles then again after like 1500 then resume normal changings.

3. Dump the rest of the can in your gas tank. I put in like 7gal up to like a half tank.

4. (optional) you can take off your intake hose and spray some throttle body cleaner into your butterfly valve...car may take a minute to turn over so i would do this before all the seafoam biz.....just a mental note

5. OK now crank your car up and watch all the smoke pour out of your car like that part of cheech and chongs when they are driving the van made out of weed.....seriously it'll smoke like a bitch....then just drive it around for a little bit at a slightly higher rpm....(i dont think any of us have any problems doing that)

like i said this will not give you magic hp but it will bring back some of that "lost" power, worked great for me