Unfortunately, sounds can be non mechanical. Such as shaking or vibrating because of expansion and contraction. You may need to get under the car to see if a loose exhaust hanger or something else is causing it. Once you think your in the right area move around and see if it's location changes...
Absolutely, you can and will have that much carbon buildup at 28k even 15k. It seems unlikely but once you know why and how the buildup occurs your suspicions will want. With no fuel to clean the back of the valves all the recirculated exhaust gas just cakes on the intake valves.
Well my opinions aside. Perhaps it's possible to get the serial number on the oil filter and find out it's manufacture date. That would allow you some extrapolation period of use plus maybe 6 months. Factoring in the average Mile's per year driven based on the current mileage and the time passed...
Don't know of a link. But I can attest that my 2007 Mazda 3 2.0 has 120000 on the odometer. I did a compression test at about 115000. The results were 190 187 185 188. That's each cyclinder. The ideal is that average of all the numbers be no more than 10% of the highest cylinder. The other part...
Simple hack. Get one of those sticky rubber jobs you put on the dash to hold your phone in there. That ight to keep things from moving around. Just cut to size.
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Furthermore uneven braking wear is more likely attributed to a poorly bled brake system. In which the proper order of bleeding g was not completed
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Your brakes will be hot to the touch no matter if it's half a mile or one mile or more or braking. Braking is achieved via friction. That causes heat. It's a four thousand pounds car. Expect it to be hot. That is not a sign of dragging brake pads. Dragging brake pads will have a sound and a...