OEM vs Aftermarket Upper Spray Arm Mount for Whirlpool: Honest Comparison (8539324)

Your Whirlpool dishwasher's top rack wobbles, water barely hits the top dishes, and you're staring at two options online: a $47 OEM part from an authorized dealer or a $9.99 aftermarket mount from Heima. You're wondering if that $37 savings means you're getting junk. Let's cut through the noise.

Quick Answer

For part 8539324, the aftermarket version wins for 90% of people. It's redesigned to be simpler than the original (no top clip or screw needed), costs 79% less, and ships faster. OEM only makes sense if you're under manufacturer warranty or need the part literally today from a local dealer.

Side-by-Side Comparison

When OEM Makes Sense

There are exactly three scenarios where paying 5x more is actually smart:

You're still under manufacturer warranty. Using aftermarket parts can void coverage on related failures. If your dishwasher's less than a year old and something else breaks, Whirlpool might deny the claim if they spot non-OEM parts.

You need it within 2 hours. Some local appliance parts stores stock OEM Whirlpool parts. If your dishwasher died mid-dinner party prep and you can't wait for shipping, that premium buys you immediate access.

You're billing a commercial customer who demands OEM. Some property management companies or commercial kitchens have policies requiring original parts. You'll pass the cost through anyway.

That's it. For everyone else, keep reading.

When Aftermarket Wins

The redesign tells you everything. Whirlpool's engineering team realized the original top mounting clip and screw were unnecessary — the aftermarket manufacturers caught on first. You're getting a newer design that's easier to install, not a cheap knockoff.

One verified buyer summed it up: "Easy repair and you had the perfect part! Fast shipping and I didn't have to buy a new dishwasher!" That's someone who spent $10 instead of $800 on a new unit because their dishes weren't getting clean on the top rack.

Here's what actually matters: the mount needs to hold the spray arm securely while allowing smooth rotation. The material quality (high-impact plastic with proper thread engagement) is identical between OEM and quality aftermarket. Both handle the same water pressure, same detergent exposure, same heat cycles.

The 365-day warranty from Heima is 4x longer than typical OEM coverage. If something's going to fail, it'll happen in the first few wash cycles — you're covered either way, but aftermarket gives you breathing room.

The Real Cost Calculation

Let's say you're fixing a GU1100XTLQ0 (one of the most common compatible models). Symptoms were clear: top rack dishes came out dirty, you could hear the spray arm wasn't spinning properly, maybe you saw water pooling weirdly during the cycle.

OEM route: $47 part + $8 shipping + 7-day wait = $55 and a week of hand-washing
Aftermarket: $9.99 part + $6 shipping + 3-day wait = $16 and back in business by Thursday

You save $39 and four days. What's the catch? There isn't one. Another user confirmed: "Perfect Fit." Two words that mean you're not gambling on quality.

Our Verdict

Buy the Heima aftermarket mount unless you're under warranty or need same-day pickup. The redesigned installation (no top clip needed) is actually better than OEM, the price difference is absurd, and the year-long warranty proves the manufacturer stands behind it. We've seen this mount work flawlessly on everything from 15-year-old Whirlpool DU1020 units to newer KitchenAid KUDS models.

Frequently Asked Questions

Will this aftermarket mount void my Whirlpool warranty?

Only if you're still under the original manufacturer warranty (typically 1 year from purchase). After that, you're free to use any compatible part. Even during warranty, they'd have to prove the aftermarket part caused a different failure — just replacing a spray arm mount won't void coverage on an unrelated motor issue.

Why is the aftermarket version redesigned without the top clip?

Whirlpool's engineers determined the top mounting clip and screw were redundant. The updated design relies on the lower threading and snap-fit mechanism, which actually reduces installation time and eliminates a potential failure point (stripped screw holes). This is an improvement, not a cost-cutting measure.

How do I know if this fits my specific Kenmore or Maytag model?

This mount replaces WP8539324, AP6013024, 8268844, and 9742994. Check your dishwasher's model number (inside the door edge) against the compatibility list on the product page. It works across Whirlpool, KitchenAid, Kenmore, and Maytag dishwashers built on the same platform — we're talking 200+ models including the entire GU1100 series, KUDS24/25 KitchenAids, and DU1020 Whirlpools.