Reddit reviews Chevron Techron Concentrate Plus Fuel System Cleaner - 20 oz.

"clean the fuel system and flush"

Unless they're removing the injectors and running them through an injector cleaning machine (strongly doubt it), I suspect they're just dumping a $13 bottle of Techron in the tank and charging you $180 for it.

The Mazda3 does not have a replaceable fuel filter. So unless they're dropping the tank, removing the pump, and replacing the filter mesh (which would probably cost well over $180), they're absolutely fleecing you. I suggest finding a different shop.

BTW, the fact that the Mazda3 doesn't have a replaceable fuel filter (just a mesh screen in the tank) should stand as encouragement to use Techron or a similar fuel cleaner additive at every oil change.

This is the one you want

I did try some fuel injector cleaner, found here. I forgot to mention that, my bad!

I was going to suggest fuel filter, but it looks like that one has only the screen in the tank, no filter in the line going to the engine.

Before worrying too much, I'd run a bottle of "Techron complete fuel system cleaner" through it. https://amzn.com/B00092893E (not because you should buy it there, but for a picture of what you'll be looking for at your FLAPS or discount store (Walmart, etc.). The only other cleaner I'd consider would be BG 44K, but that's harder to find and a lot more expensive. Do not use any cleaner with alcohol in it (SeaFoam in particular), as that can cause more problems than it solves.

Vacuum leaks (like intake gaskets) tend to make it run lean at idle and low load (high vacuum) conditions, not at full throttle.

You could try a fuel injector cleaner before anything else. I've heard many people say it fixes their fuel level gauge, and in addition, cleans your injectors.

Most recommend this brand - Chevron Techron - https://www.amazon.com/Chevron-Techron-Concentrate-System-Cleaner/dp/B00092893E

This stuff?

http://www.amazon.com/Chevron-65740-Techron-Concentrate-Cleaner/dp/B00092893E/ref=cm_cr_pr_product_top

Techron Concentrate Plus: https://www.amazon.com/Chevron-65740-Techron-Concentrate-Cleaner/dp/B00092893E

It's also sold as KIA part# UM011 CH056, as a 12oz bottle. Just get the 20oz for same price (or cheaper) and use the whole thing.

I second the 40PSI tires, new plugs, wires, rotor, air filter, and maybe a few tanks of injector cleaner. Most is snake oil but this brand has some science and mechanic support http://www.amazon.com/Chevron-65740-Techron-Concentrate-Cleaner/dp/B00092893E

Edit: Oh - and play with lighter weight oils like 0w-30. Just watch to be sure it's not burning it too fast.

Not certified but I've been working bimmers for my for most of my life, and from the video you're right, it does sound like the n52 tick, however I've never heard a tick like this in the n55. I figured it would of been resolved. I would throw a bottle of Techron in it with a full fill up of 93, wait a week and put another bottle of Techron in it in your next fill up, in addition make sure both techron fill ups are 93. Don't skimp on anything, make sure it's Techron or other may suggest redline is ok to use in BMWs. Techron and Redline are essentially fuel, lifter and injector cleaners, just buy the bottle and dump it in with a full tank of gas. If after a month it's still there I would take it to the dealer if it's still in warranty.

http://www.amazon.com/Chevron-65740-Techron-Concentrate-Cleaner/dp/B00092893E/ref=sr_1_1?s=automotive&ie=UTF8&qid=1398443713&sr=1-1&keywords=chevron+techron

You're doing a good job. I'm the only owner of my 2010 prius. Got it with 3 miles. One of the first ones to hit the US soil. Besides oil changes, tire rotations, filter changes, wipers, etc... I haven't done anything special. I did get the trans fluid drained and replaced around 60K and the brake fluid replaced a little after that probably.

If you want to keep your internals clean run a bottle of Techron through your car once every 5K miles or so. https://www.amazon.com/Chevron-65740-Techron-Concentrate-Cleaner/dp/B00092893E/ pour it into your gas tank before filling up and let it do its job. You can find it at Walmart or any auto parts store.

https://www.amazon.com/Red-Line-Complete-System-Cleaner/dp/B000CPI5Z0/ This is better but I can't find it anywhere locally and have to order it.

I don't think it really matters, but people say to use these before oil changes so any gunk that is broken up from using them will be removed when the oil is changed. I don't think that matters though since it gets thrown out of the exhaust anyway.

Good luck!