Well, finally saved up the money and did the dreaded Ford/Mazda 3.7 Water Pump Service. It is a 2009 model CX-9 with 170K miles and figured I had tempted fate long enough. If the weep hole gets plugged the water pump will back coolant up into the crankcase and you know the rest. This engine uses oil. A 4500 lb vehicle with a high revving low torque engine is gonna work the engine hard especially putting around town. I learned years ago, the thicker the oil the better in this engine. Instead of 1 to 2 quarts between 10K oil changes, a 10W-40 or 15W-40 will need about a half quart to a quart in 10K miles. I tell the repair shop this. I get the standard "OOOOhhhhh, thats to thick, the factory specs 5W-20 blah, blah, blah, etc.". I'm like "look, I know this car, it LIKES 15w-40, put that in after you do the service, thank you". I get the car back and sure enough they put almost thin as cat piss 5W-20 in it. We get it back to the house and I check the level and all is good. I get busy and don't check the oil for about 2 months and about 3000 miles. I check and HOLY ****! It 's barely even touching the dip stick! So, time to change the oil. Out goes the Cam2 5w-20 cat urine and in goes the Delvac. 3000 miles later, no top off needed. All is good in the world. Oh, I asked the tech who did the service "how'd the valvetrain and timing gear area look?". "Great, that is a **** clean engine for 170K". I said "Thanks, 7500 to 10000 mile intervals with HDEO". Tech says "No way".