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Description
Thermostat Kit (130°F/54°C) – Fits Mercury Marine 200-300 HP Outboards (Replaces 8M0057307, 885599003)Thermostat Kit (1306F 546C) 6 Fits Mercury Marine 200 300 HP Outboards (Replaces 8M0057307, 885599003) This thermostat kit is designed for use with Mercury Marine 200 300 HP 6 cylinder outboard engines, including 2. 5L, 3. 0L, and 3. 2L EFI DFI engines and the Pro XS, Sport XS, and XS series. It serves as a direct replacement for multiple Mercury and Sierra OEM part numbers, ensuring compatibility and straightforward installation. Includes 2
Thermostat Kit (1306F/546C) 6 Fits Mercury Marine 200-300 HP Outboards (Replaces 8M0057307, 885599003)
This thermostat kit is designed for use with Mercury Marine 200-300 HP 6-cylinder outboard engines, including 2.5L, 3.0L, and 3.2L EFI/DFI engines and the Pro XS, Sport XS, and XS series.
It serves as a direct replacement for multiple Mercury and Sierra OEM part numbers, ensuring compatibility and straightforward installation.
- Includes 2 thermostats and 2 thermostat cover gaskets.
- Installation is a direct fit for specified Mercury Marine engine models.
- Temperature rating: 1306F (546C).
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number | Superseded By | Notes |
|---|---|---|---|
| Mercury | 8M0057307 | ||
| Mercury | 885599003 | 8M0057307 | |
| Mercury | 885599004 | 8M0057307 | |
| Mercury | 8855991 | 8M0057307 | |
| Sierra | 18-3606 | ||
| Sierra | 18-3535 | ||
| Sierra | 18-3675 |
Compatible Engine Models
Confirm your engine model/year in the table below. For Mercury owners, here9s a guide to help you identify your engine9s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | 200 (3.0L EFI) | 200 | 4-Stroke | 0T750164-0T800999 | 885599003 | |
| Mercury | 200 (3.0L EFI) | 200 | 4-Stroke | 0T801000-1B417701 | 8M0057307 | |
| Mercury | 200 (3.0L EFI) | 200 | 4-Stroke | 1B417702-1B504988 | 8M0057307 | |
| Mercury | 200 (3.0L EFI) | 200 | 4-Stroke | 1B504989-2B528096 | 8M0057307 | |
| Mercury | 200 HP 6 CYL (2.5L) | 200 | 4-Stroke | 0T599000-0T800999 | 885599003 | |
| Mercury | 200 HP 6 CYL (3.0L) | 200 | 4-Stroke | 0T801000-1B417701 | 8M0057307 | |
| Mercury | 200 HP 6 CYL (3.0L) | 200 | 4-Stroke | 1B417702-1B504988 | 8M0057307 | |
| Mercury | 200 HP 6 CYL (3.0L) | 200 | 4-Stroke | 1B504989-1B912785 | 8M0057307 | |
| Mercury | 200 HP 6 CYL (3.0L) | 200 | 4-Stroke | 1B912786-2B535571 | 8M0057307 | |
| Mercury | 200 HP DTS 6 CYL (3.0L) | 200 | 4-Stroke | 0T980000-1B417701 | 8M0057307 | |
| Mercury | 200 HP DTS 6 CYL (3.0L) | 200 | 4-Stroke | 1B417702-1B504988 | 8M0057307 | |
| Mercury | 200 HP DTS 6 CYL (3.0L) | 200 | 4-Stroke | 1B504989-1B964735 | 8M0057307 | |
| Mercury | 200 HP Pro XS 6 CYL (3.0L) | 200 | 4-Stroke | 1B504989-1B912785 | 8M0057307 | |
| Mercury | 200 HP Pro XS 6 CYL (3.0L) | 200 | 4-Stroke | 1B912786-2B535571 | 8M0057307 | |
| Mercury | 225 (3.0L EFI) | 225 | 4-Stroke | 0T409000-0T800999 | 885599003 | |
| Mercury | 225 (3.0L EFI) | 225 | 4-Stroke | 0T801000-1B417701 | 8M0057307 | |
| Mercury | 225 (3.0L EFI) | 225 | 4-Stroke | 1B417702-1B504988 | 8M0057307 | |
| Mercury | 225 (3.0L EFI) | 225 | 4-Stroke | 1B504989-2B528096 | 8M0057307 | |
| Mercury | 225 (3.0L EFI) MARATHON | 225 | 4-Stroke | 0T801000-1B417701 | 8M0057307 | |
| Mercury | 225 (3.0L EFI) SEAPRO | 225 | 4-Stroke | 0T801000-1B417701 | 8M0057307 | |
| Mercury | 225 HP 6 CYL (2.5L) | 225 | 4-Stroke | 0T599000-0T800999 | 885599003 | |
| Mercury | 225 HP 6 CYL (3.0L) | 225 | 4-Stroke | 0T801000-1B417701 | 8M0057307 | |
| Mercury | 225 HP 6 CYL (3.0L) | 225 | 4-Stroke | 1B417702-1B504988 | 8M0057307 | |
| Mercury | 225 HP 6 CYL (3.0L) | 225 | 4-Stroke | 1B504989-2B535086 | 8M0057307 | |
| Mercury | 225 HP DTS 6 CYL (3.0L) | 225 | 4-Stroke | 0T599000-1B417701 | 8M0057307 | |
| Mercury | 225 HP DTS 6 CYL (3.0L) | 225 | 4-Stroke | 1B417702-1B504988 | 8M0057307 | |
| Mercury | 225 HP DTS 6 CYL (3.0L) | 225 | 4-Stroke | 1B504989-1B964735 | 8M0057307 | |
| Mercury | 225 HP Pro XS 6 CYL (3.0L) | 225 | 4-Stroke | 1B104549-1B426560 | 8M0057307 | |
| Mercury | 225 HP Pro XS 6 CYL (3.0L) | 225 | 4-Stroke | 1B426561-1B752546 | 8M0057307 | |
| Mercury | 225 HP Pro XS 6 CYL (3.0L) | 225 | 4-Stroke | 1B752547-2B535608 | 8M0057307 | |
| Mercury | 225 HP SPORT XS 6 CYL (2.5L) | 225 | 4-Stroke | 1E002584-1E050825 | 8M0057307 | |
| Mercury | 225 HP SPORT XS 6 CYL (3.0L) | 225 | 4-Stroke | 1E000797-1E002583 | 8M0057307 | |
| Mercury | 225 HP XS 6 CYL (2.5L) | 225 | 4-Stroke | 1E002584-1B792195 | 8M0057307 | |
| Mercury | 250 (3.0L EFI) | 250 | 4-Stroke | 0T409000-0T800999 | 885599003 | |
| Mercury | 250 (3.0L EFI) | 250 | 4-Stroke | 0T801000-1B417701 | 8M0057307 | |
| Mercury | 250 (3.0L EFI) | 250 | 4-Stroke | 1B417702-1B504988 | 8M0057307 | |
| Mercury | 250 (3.0L EFI) | 250 | 4-Stroke | 1B504989-2B528096 | 8M0057307 | |
| Mercury | 250 HP 6 CYL (3.0L) | 250 | 4-Stroke | 1B528615-2B535086 | 8M0057307 | |
| Mercury | 250 HP Pro XS 6 CYL (3.0L) | 250 | 4-Stroke | 1B426561-1B752546 | 8M0057307 | |
| Mercury | 250 HP Pro XS 6 CYL (3.0L) | 250 | 4-Stroke | 1B752547-2B535608 | 8M0057307 | |
| Mercury | 250 HP Sport XS 6 CYL (2.5L) | 250 | 4-Stroke | 1E002342-1E051823 | 8M0057307 | |
| Mercury | 250 HP Sport XS 6 CYL (2.5L) | 250 | 4-Stroke | 1E051824-1E052994 | 8M0057307 | |
| Mercury | 250 HP XS 6 CYL (3.0L) | 250 | 4-Stroke | 1E002342-1E051113 | 8M0057307 | |
| Mercury | 250 HP XS 6 CYL (3.0L) | 250 | 4-Stroke | 1E053158-1E053958 | 8M0057307 | |
| Mercury | 250 LONG (3.0L)(EFI) | 250 | 4-Stroke | 0T861319 6 UP | 8M0057307 | |
| Mercury | 300 HP XS 6 CYL (3.2L) | 300 | 4-Stroke | 1E001867-1E052057 | 8M0057307 | |
| Mercury | 300 HP XS 6 CYL (3.2L) | 300 | 4-Stroke | 1E052058-1E053987 | 8M0057307 | |
| Mercury | 3.0L EFI MARATHON | - | 4-Stroke | 0T409000-0T800999 | 885599003 | |
| Mercury | 3.0L EFI SEAPRO | - | 4-Stroke | 0T409000-0T800999 | 885599003 | |
| Mercury | 3.0L DSI (Diesel Spark Ignition) | - | 4-Stroke | 1E052967 & UP | 8M0057307 | |
| Mercury | JP 3.0L DFI | - | 4-Stroke | 0T997974-1E003045 | 8M0057307 | |
| Mercury | JP 3.0L DFI | - | 4-Stroke | 1E003046 & UP | 8M0057307 |
Technical Specifications
| Specification | Value |
|---|---|
| Product Type | Thermostat Kit |
| Installation | Direct fit |
| Temperature Rating | 1306F (546C) |
| Application | Outboard engines |
| Engine Type | 6-cylinder |
| Engine Displacement | 2.5L, 3.0L, 3.2L |
| Weight | 3.2-4.0 oz (90-113g) |
Package Contents
- 2 x Thermostats (8M0057307)
- 2 x Thermostat Cover Gaskets (27-8503181)
Installation Guide
- Remove the old thermostat and gasket from your engine.
- Clean the thermostat housing surface thoroughly to remove any debris or old gasket material.
- Install the new thermostat into the housing.
- Place the new gasket on top of the thermostat.
- Reattach the thermostat cover securely.
- Torque bolts to manufacturer specifications to avoid leaks.
- Refill and check the coolant system for proper levels if applicable.
- Start the engine and allow it to reach operating temperature to confirm proper thermostat function.
Troubleshooting & FAQ
How do I confirm this fits my engine?
Refer to the compatibility table and verify your engine's model, rated horsepower, and serial number range.
How often should I replace the thermostat?
Replace the thermostat as part of routine engine maintenance or if you experience overheating issues.
What are the differences between this aftermarket thermostat and the OEM part?
This listing is an aftermarket replacement part (not an OEM component). It is built to OEM specifications with comparable-grade materials and inspected for quality control in an ISO9002-certified facility.
What are common signs of a failing thermostat?
Engine overheating, fluctuating temperature gauge, and poor engine performance can indicate thermostat failure.
OEM vs. Aftermarket?
This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.
How fast do you ship and how much does it cost?
We offer fast global shipping 7typically 515 days worldwide and standard shipping is free. Expedited options are available at checkout depending on your location.
What is your warranty and return policy?
This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.
Important Notes
- Verify that the product images and specifications match your original part. If discrepancies exist even if your model is listed do not proceed with the purchase.
- This product is an aftermarket replacement part and is not an OEM component.
- Professional installation is recommended to ensure safety and optimal performance.
Why Choose JLM MARINE?
- Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
- Fast Global Shipping: Free delivery worldwide in 515 days.
- Direct from Manufacturer: Competitive pricing without compromising quality.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.4 ★★★★★
Based on 18 reviews
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Product Reviews
★★★★★ 5
Package
Size: X-Large, Color: Burgundy
Excellent fit and fast delivery!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 5, 2026
★★★★★ 4
Great suit, but size up
Size: Large, Color: Black, Size: Large, Color: Black
This set comes with a jacket, pants, extra buttons, and a bow tie with an easy clip to remove it. The suit itself is really nice and I love the pattern, however, I thought I purchased a XXL, but seemed to have ordered a L instead. Not quite sure how that happened, but suffice to say, he could not fit the suit. He is normally an L in pants, so based on the fit, we would have needed to size up anyways. He couldn't fit his leg in the pants or his arm in the jacket. I automatically size up on items like this because you can take clothes in, but can't take them out if there is not enough cloth. The suit pants are not lined, but you can see that they did leave room for the legs to be let out. Perhaps if we have the pants let out, he would be able to wear the pants. The jacket is fully lined and it comes with two inside pockets, one can be buttoned. I cannot tell if the jacket has room for alterations, but I might have him fitted for it just to see. It comes with a slit on the back of the jacket, so it has that going for it from a quality standpoint. It does come folded so you have iron or dry clean it before wearing. The quality is good for the most part. There are some threads coming out of the bow tie, but that's all I seen that is less the good. I'm giving it four star based solo on it's look and feel. Of course, I can't comment on the fit. For around $80, I definitely think it's worth checking out for a school semi-formal or fancy dinner out. It might be a little lightweight for a higher end event. Did I say I love the pattern?
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Reviewed in the United States on April 9, 2026
★★★★★ 5
Stylish look and great value for special occasions
Size: X-Large, Color: Blue, Size: X-Large, Color: Blue
This suit looks really good in person. The pattern adds a nice touch that makes it stand out without looking too flashy. It is a great option for events like weddings, parties, or prom where you want something a bit different from a basic suit.
The fit is slim and modern, giving a clean and sharp look when worn. It feels comfortable enough for a few hours, and the overall shape looks more tailored than expected for the price. The jacket sits well, and the pants match nicely to complete the set.
The material is lightweight and decent for occasional use. It does not feel like a premium suit, but it looks good and photographs well, which is what matters for events. The bow tie included is a nice extra and helps complete the outfit without needing to buy more pieces.
It may need a quick steam or ironing out of the package to look its best. Also, checking the size chart is important to get the right fit.
For the price, this is a very good value. You get a full outfit that looks stylish and put together without spending too much. Great option if you need something affordable for special occasions.
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Reviewed in the United States on April 21, 2026
★★★★★ 5
Stylish Statement Suit for the Price
Size: Medium, Color: Gold - Embroidery, Size: Medium, Color: Gold - Embroidery
I really like the black with gold embroidery on this suit - it really will make you stand out. The gold does have a slight green tint to it in certain lighting, but overall I like the unique design and think it looks great.
The pants have some flexibility, which made them more comfortable than I expected. I got a Medium - and im usually a 32W. I could see it fitting a 30W or34W too. It arrived in great shape and was not wrinkled at all, though i'm likely going to have to hem the pants 1-2 inches. The pants are neutral and could be worn with other black jackets.
I am usually a size 42 bust in jackets, and while the size chart says medium is a 44 bust, i think this fits me like a glove.
It also came with a bow tie, which is a nice added bonus. Overall, I think this is a great deal for the price and a solid choice for anyone looking for a versatile standout suit for a formal event or a costume party.
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Reviewed in the United States on April 19, 2026
★★★★★ 5
Way better than expected - Not a "costume" at all!
Size: X-Large, Color: Christmas Green
I’m going to be honest: I was fully prepared to open this package and find a cheap, shiny, flammable-looking costume that belonged in a discount Halloween store. Buying a tuxedo on Amazon feels like a total gamble, and I was definitely a skeptic.
I couldn’t have been more wrong. This suit is actually fantastic.
First off, the fabric. It doesn’t have that "plastic" feel I was dreading; it actually feels elegant and has a nice weight to it. The floral pattern is sharp and the colors are vibrant without being "too much." It looks way more expensive than the price tag suggests.
The fit was the biggest surprise. I’m always wary of "slim fit" labels, but this hit the mark perfectly. It’s tailored in the right places without feeling like I’m about to burst a seam if I sit down.
I originally bought this thinking it might work for a one-off event, but now I’m genuinely excited to break it out for an upcoming casino night and a wedding later this year. If you’re on the fence because you’re worried about Amazon quality, just go for it. This is a legitimate suit that’ll definitely get you some compliments. 10/10 would buy again.
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Reviewed in the United States on April 7, 2026