I've got a 2012 Tacoma 2.7 that i've had for 14 months. Today while checking my oil, I noticed that my coolant level was an inch or more below the full line. I checked it first thing this morning while cold after it had set overnight. Just wandering if anyone has experienced this and looking for a bit of advice. I have noticed since it was new, there is always a little residue surrounding the hose that fits on the top of the reservoir, I clean it up periodically when im under the hood and it keeps coming back. I have considered putting a hose clamp or twisting a piece of wire around it. Any suggestions or ideas why the level is low? Is this common?