c/auto-mechanics

Update: I was convinced those magnetic oil drain plugs were just snake oil

A customer at my shop in Tacoma insisted on installing one on his F-150, claiming it would catch metal shavings. After 5,000 miles, we pulled it and the magnet was covered in fine ferrous particles I wouldn't have seen otherwise. Has anyone else seen a real benefit from these, or did we just get lucky with that specific engine?

Overheard a customer call their alternator a 'generator' at the shop today

I was doing a belt inspection on a 2017 F-150 and the owner was telling his friend the 'generator' was making noise. It made me realize how often regular folks mix up basic parts. I explained the alternator charges the battery while the engine runs, but a generator is a whole different piece of equipment. How do you guys handle explaining parts to customers without sounding like you're talking down to them?

Finally figured out why my brake caliper slide pins kept seizing up

For the past year, I was just cleaning them with brake cleaner and slapping on whatever grease I had around, usually some leftover wheel bearing grease. A guy at the parts counter in Boise saw my cart and asked if I was doing brakes, then handed me a $8 tube of silicone-based caliper grease. He said the regular stuff cooks off and turns into glue. I tried it on a 2017 F-150 last week, and the difference is night and day. What other little things like that did you guys learn way later than you should have?

Can we talk about the time a customer called me out on my torque wrench habit?

I was doing a brake job on a 2018 F-150 last Thursday and just snugged the caliper bracket bolts by feel like I always do. The customer, who turned out to be an old school mechanic, watched me and said, 'You know, guessing on those is how you get a comeback for a noise.' I felt pretty dumb. I stopped right then, grabbed my Snap-on tech wrench, and torqued them to the book spec of 125 foot-pounds. Now I pull out the torque wrench for every single bolt on a brake job, no exceptions. Anyone else have a simple habit they had to break after getting called on it?

Just pulled a head off a 2018 Silverado that had me shaking my head

The truck came in with a misfire and low compression on cylinder 3. When we got the head off, the exhaust valves were caked with carbon, but the intake valves were almost clean. The owner said he only used top-tier gas for the first 50,000 miles, then switched to the cheapest stuff at a no-name station for the next 30,000. That's exactly when the problems started. The cheap gas had way more junk in it, and with direct injection, that junk just bakes onto the hot exhaust valves. It took us 8 hours to clean and re-seat everything. Has anyone else seen this kind of damage from a specific fuel switch in under 100k miles?

My neighbor said his 'check engine light just turned off on its own' after ignoring it for a month.

It made me realize how many customers probably think intermittent faults are fixed when they just stop seeing the warning, so now I always explain that a stored code is like a recorded history, not a current alert.

I know everyone swears by the 3-ton floor jack, but my little 1.5-ton from Harbor Freight has been my go-to for 90% of jobs for the last 4 years.

Saw something at the Pick-n-Pull in Fresno that got me worried

I was there last Friday pulling a door for a customer's 2015 F-150. I watched a guy try to take a front strut off with just a standard 3/8 ratchet and a pickle fork. He was reefing on it so hard the whole car was rocking, and the spring wasn't even compressed. He was one slip away from that thing shooting across the yard. Do you guys see this kind of stuff often? What's the best way to tell a DIYer at a yard they're about to have a bad day without starting a fight?

Vent: A simple brake job turned into a 3-hour fight with a seized caliper pin

It was a 2008 Civic, and the lower pin was so stuck I had to use a torch and a 3-pound sledge. Has anyone found a better way to free those things without destroying the bracket?

Just spent 6 hours on a 'simple' coolant leak that was a cracked heater core pipe under the intake

It was buried so deep I had to pull the whole upper manifold just to see it. Anyone else run into this on the newer Ford Ecoboost 2.0s?

Warning: I just read that a typical shop vacuum pulls less than half the CFM of a dedicated brake bleeder, and I've been using mine wrong for years.

Hot take: The way we handle brake jobs has flipped in the last five years

I just finished a brake job on a 2019 Silverado, and it hit me how different the process is now. Five years back, the standard move was to slap on new pads and rotors, maybe turn the old rotors if they were thick enough, and call it a day. Now, with so many trucks and SUVs having electronic parking brakes, you have to put the vehicle into service mode with a scan tool before you even pull a wheel. I had a job last week where I forgot that step on a Ford Explorer and spent an hour fighting a caliper piston that wouldn't budge. The old way was mostly mechanical skill, but now you need to know the software side too. It feels like the job went from being about pure wrenching to half wrenching, half computer work. Has anyone else noticed this shift, and what scan tool are you using for these service modes?

I finally had to choose between a cheap aftermarket radiator or a pricey OEM one for a 2012 Civic last week.

I went with the aftermarket part to save the customer $200, but it leaked at the upper hose neck after just 3 days, so what's your go-to brand for reliable cooling system parts that won't fail immediately?

Update: That day a customer's old truck taught me about vacuum leaks

Had a 1987 Ford F-150 come in with a rough idle that three other shops couldn't fix. I spent maybe an hour just listening with a piece of heater hose, and found a tiny crack in a vacuum line behind the intake that sounded like a hissing snake. Anyone else have a go-to method for tracking down those sneaky vacuum leaks on older engines?

I always thought the old-school feeler gauge was fine for setting valves, but a dial indicator changed the game

I was doing a valve adjustment on a Honda K24 last week, and for years I just used my trusty feeler gauge set. My buddy lent me his dial indicator setup, and the difference was huge. The feeler gauge method felt like a guess compared to seeing the exact thousandth of an inch lift on the dial. I got the lash perfect on the first try, and the engine idles smoother now. Anyone else made the switch and have a favorite brand for those dial indicator bases?

TIL my old way of finding TDC was a total joke

Honestly, for years I'd just stick a screwdriver in the spark plug hole and turn the crank by hand, listening for the 'puff' and feeling for the push. Ngl, it worked maybe 60% of the time. What changed was last month when I was doing a timing belt on a Honda Civic and my buddy Mike walked in, saw me doing it, and just said, 'Dude, a $20 piston stop tool, seriously.' I bought one that afternoon. Has anyone else had a 'why did I ever do it the hard way' moment with a basic task?

A 2018 F-150 with a coolant leak showed me why you should always check the oil cooler housing.

The truck came in for a small drip, but after a week the whole front cover was soaked. Pulled the housing and found the factory gasket had turned to mush. How many of you have seen this on the newer 5.0s?

A guy at a parts counter in Fresno said I was over-torquing aluminum valve covers. He was right.

Had a close call with a hybrid battery pack at a shop in Tacoma

We were doing a coolant flush on a 2018 Prius and the tech next to me dropped a wrench. It bounced and hit the orange high voltage cable under the car. There was a loud pop and a flash, and the whole car shut down. The shop manager had to call a specialist to come check the whole system, which cost the customer over $800 extra. Now I double check for any tools near those cables before I even lift the car. Has anyone else had a scare like that with a hybrid or electric vehicle?

Old kitchen drawer now holds my socket set

I had an old kitchen drawer from a remodel. I cleaned it up and added some dividers. Now all my sockets are sorted by size. It saves me a lot of time when I'm under a car. You could try this with any spare drawer you have.

Appreciation post: My friend's stunned expression after I fixed his car's radiator hose.

I mean, a simple job, but his surprise was awesome.

DAE get a little proud when you catch a problem during a routine oil change that could've been major?