How Visiting Local Workshops Helped Us Redesign Our Filters

On paper, our oil filters looked perfect.

• Correct dimensions
• Correct micron rating
• Strong materials
• All lab tests: ✅ Passed

From an engineer’s perspective, everything was “within spec.”
From a catalog perspective, the product was “good enough.”

But one distributor kept giving me the same feedback:

“Bruce, mechanics don’t love them yet.
They say ‘it works’, but not ‘this is better’.”

That one sentence changed the way I think about product development in the automotive aftermarket.

Because in this business, the person who really decides if your product wins is not:

• the engineer
• the purchasing manager
• the salesman

It’s the mechanic, under the car, with dirty hands and limited time.

This is the story of how visiting local workshops and listening to mechanics helped us redesign our filters and move from “it works” to “this feels right.”

1. When Lab Performance Is Not Enough in the Aftermarket

At the beginning, our mindset was very typical:

• follow OE dimensions
• meet or exceed OE filtration efficiency
• use strong, reliable materials
• pass all the lab and bench tests

On paper, this is exactly what a “good filter” should be.

Our testing covered:

• burst pressure
• filtration efficiency
• flow rate
• anti‑drainback valve function
• sealing performance

The results were solid.
Our internal reports looked great.

Yet, our distributor’s message stayed the same:

“They work, but mechanics don’t prefer them.
If there’s another brand in stock,
they don’t actively choose yours.”

This is a very important distinction:

• “It works” = technically OK, but emotionally neutral
• “This is better” = preferred, recommended, requested

In the aftermarket, that difference can decide:

• which filter the workshop reaches for first
• which brand mechanics recommend to car owners
• which product gets repeat orders organically

So I realized:

If we wanted to become a preferred brand, not just an acceptable one,
we had to get out of the office and into the field.

2. Field Visit: From Meeting Room to Workshop Floor

On my next trip to visit this distributor,
I changed my normal routine.

Instead of spending most of the time in:

• office meetings
• PowerPoint discussions
• Excel review sessions

I asked him a simple question:

“Can you take me to the workshops you supply?”

He agreed.
We spent two full days visiting local garages and workshops.

There was:

• no formal presentation
• no projector
• no big speeches

Just:

• coffee
• dirty hands
• and real conversations with the people who use our filters every day.

This kind of visit is very different from a trade show or a conference:

• you see reality, not theory
• you see what people actually do, not what they say on a survey
• you see hundreds of small details that never appear in a lab report

3. Observing Mechanics: How Filters Are Really Used

During those 2 days, I tried not to “sell” anything.
I just watched and asked questions.

I paid attention to how mechanics:

• removed the old filter
• grabbed and held the new filter
• positioned their hands when tightening
• handled the used filter after removal
• moved around the vehicle during an oil change

Some specific observations stood out.

3.1 How They Removed the Old Filter

I watched:

• what tools they used (wrench, hand, strap, etc.)
• how much force was needed
• how much oil spilled during removal

Sometimes, the mechanic had to:

• use extra tools to get a good grip
• wipe the filter just to hold it properly
• adjust his body position multiple times

You could see small signs of frustration, even if they didn’t complain verbally.

3.2 How They Grabbed and Held the New Filter

This was especially interesting.

I focused on:

• how they picked the new filter from the box
• where they naturally placed their fingers
• whether the surface was easy to grip, especially with oily hands

One small detail really opened my eyes:

One mechanic wrapped tape around the filter
to give himself a better grip while tightening.

From a lab perspective, our filter shell was perfectly fine.
From his perspective, it was too smooth for real working conditions.

3.3 How They Dealt With Oil Drain and Cleanliness

I also watched how they handled oil drainage:

• how they positioned the used filter
• how they tried to get as much oil out as possible
• where they let the oil drip

Another moment stood out:

A mechanic hit the filter against the floor
to let oil drain faster and more completely.

It looked a bit “rough,” but it was his way of:

• saving time
• reducing mess
• making sure the filter didn’t leave too much oil trapped inside

Our lab tests didn’t include:
“mechanic hitting filter on floor to speed up oil drain.”
But in real life, it happens.

3.4 What They Said About Seals and Installation

Several mechanics commented on the sealing ring:

• “The seal is OK, but a bit too hard in winter.”
• “In cold days, I need more force to get it seated comfortably.”

Again, on paper:

• seal hardness was within standard range
• sealing test results were fine

But in the workshop:

• the feeling during installation mattered
• especially in low temperatures

None of these things are part of a typical lab specification sheet.
But for the person under the vehicle,
they matter a lot.

4. What We Learned: Lab Reality vs. Workshop Reality

After two days of observing and talking to mechanics, one thing became clear:

There is a gap between “engineer reality” and “mechanic reality.”

On the engineer side, we think about:

• filtration efficiency
• burst pressure
• material strength
• technical specifications

On the mechanic side, they feel:

• grip
• comfort
• speed
• effort
• small annoyances

Both views are important, but only one happens under the car, every day.

Some key insights we took home:

• A filter can be technically correct, but not pleasant to work with.
• Tiny details (like surface texture or seal softness) can make a big difference in daily use.
• Mechanics often adapt the product to their needs (tape, hitting, extra tools) when the design doesn’t fully support them.

These insights reshaped how we approached product design.

5. Back to China: Turning Workshop Feedback Into R&D Actions

I went back to China with a different mindset.

I didn’t just bring photos and notes.
I brought stories of real people:

• the mechanic who wrapped tape around the filter
• the one who hit it on the floor to drain oil
• the ones who talked about seal hardness in winter

Together with our R&D team, we reviewed:

• our existing designs
• workshop feedback
• potential adjustments that would not compromise technical performance

We focused on three main areas.

5.1 Adjusting the Shell Texture for Better Grip

First, we addressed the grip issue.

We asked:

• how can we help mechanics hold the filter more securely,
  especially with oily hands and in tight spaces?

We adjusted:

• the surface texture of the shell
• used a design that provided more friction
• without affecting the structural strength or appearance

This was a small change in production,
but a big change in handling.

Now, instead of needing tape or extra tools,
a mechanic could grip the filter more confidently with a gloved hand.

5.2 Softening the Sealing Ring for Low Temperatures

Next, we focused on the sealing ring hardness, especially in cold climates.

We worked on:

• slightly softening the compound used in the sealing ring
• making sure it still kept excellent sealing performance
• ensuring durability over the full service interval

The goal was:

• easier seat and compression in low temperatures
• more comfortable installation torque
• no negative impact on long‑term sealing behavior

We validated the new seal design through:

• lab testing
• environmental (temperature) testing
• and then real field feedback

5.3 Improving the Inner Design for Cleaner Oil Drain

Finally, we looked at the inner design related to oil drainage.

We explored:

• internal geometry that would allow oil to flow out more completely
• reducing the tendency for oil to get “trapped” inside the filter after removal

The result:

• when mechanics removed the filter and let it drain,
  more oil came out more quickly
• less mess
• easier handling and disposal

Again, this is something you don’t see in a standard data sheet,
but it changes the daily experience of using the product.

6. The Follow‑Up Visit: Quiet Confirmation from Mechanics

On my next visit to that market,
I brought the updated filters.

We didn’t arrive with:

• big marketing speeches
• printed brochures saying “New Improved Design!”
• or a long technical explanation

We simply:

• visited the same workshops
• met the same mechanics
• and put the new filters in their hands

Then we watched.

Their reactions were simple and honest:

• “Ah, this is easier.”
• “Now this feels right.”

No dramatic comments.
No “wow, this is revolutionary.”

Just:

• smoother installation
• more comfortable grip
• better feeling at the seal

And in real life, that quiet satisfaction is exactly what you want.

Because when mechanics feel:

• “This filter is comfortable to use”
• “This feels right in my hand”

they are much more likely to:

• choose your brand first
• recommend it to others
• ask the distributor to keep stocking it

No big marketing claims.
Just daily preference from the people who matter most.

7. The Lesson: Design for the Mechanic’s Hands, Not Only the Drawing

This whole journey taught me something important:

Real product improvement doesn’t start in the meeting room.
It starts where the product is used.

If you design only for:

• the engineer’s drawing
• the specification sheet
• the lab report

you may create a product that is:

• correct
• functional
• acceptable

But if you design also for:

• the mechanic’s hands
• the workshop workflow
• the real environment (oil, cold, tight spaces)

your product can become:

• a preferred choice
• a brand that mechanics trust and like to use

In the aftermarket, this difference is huge.

Because the mechanic is not just another user.
He is your real product tester, every day.

8. What This Means If You’re a Distributor or Importer of Auto Filters

If you are an importer or distributor,
you know how important mechanics are in your market.

They decide:

• which filters are “OK”
• which filters are “better”
• which brands they recommend when the car owner says:

“What do you suggest?”

When you choose a filter supplier, look beyond:

• catalog specs
• price per piece
• lab reports

Ask questions like:

• “Have you visited workshops in our type of market?”
• “What changes have you made based on mechanic feedback?”
• “How do you integrate field visits into your R&D process?”

Because a supplier who listens to mechanics and adjusts products accordingly is more likely to:

• support your brand positioning
• reduce complaints from workshops
• help you build loyalty at the mechanic level

That loyalty is what creates:

• repeat orders
• stable volumes
• predictable growth over time

9. If You Want a Filter Supplier Who Listens to the Field

We don’t just sit in meeting rooms and look at drawings.

We believe in:

• visiting workshops
• talking directly to mechanics
• watching how filters are used in real conditions
• bringing those insights back to our R&D and production teams

If you want a filter supplier who:

• is willing to go into the workshops with you
• listens to local mechanics
• adapts products to how your market really works
• balances lab performance and field comfort

I’d be happy to discuss your needs:

• key vehicle parc in your market
• special climate or usage conditions
• mechanics’ habits and preferences
• where your current filters are “OK” but not yet “preferred”

📩 bruce.gong@belingparts.com
🌐 www.belingparts.com

When you design for the mechanic’s hands –
not only for the engineer’s drawing –
your filter stops being “one more option”
and starts becoming the first choice.