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Description
mercury gear lube Mercury 8M0078015 Racing Gear Lube 85W-90 — 1 QuartMercury 8M0078015 Racing (Extreme Performance) Gear Lube 85W 90, 1 Quart Genuine Mercury Racing gear lube (8M0078015) formulated at SAE 85W 90 for high load, high heat marine gearcases. Its tackifiers and pressure additives help maintain a protective oil film under extreme thrust loads, while advanced emulsifiers provide protection even if water enters the gear housing. Applications For high performance outboard and sterndrive gearcases that specify
Mercury 8M0078015 — Racing (Extreme Performance) Gear Lube 85W-90, 1 Quart
Genuine Mercury Racing gear lube (8M0078015) formulated at SAE 85W-90 for high-load, high-heat marine gearcases. Its tackifiers and pressure additives help maintain a protective oil film under extreme thrust loads, while advanced emulsifiers provide protection even if water enters the gear housing.
Applications
For high-performance outboard and sterndrive gearcases that specify 85W-90 Mercury Racing/Extreme Performance gear lube. Typical use includes performance gearcases on Mercury/MerCruiser platforms. Always confirm the required lubricant in your owner’s or service manual before filling.
Shipping & Returns
Fast processing and shipping from our marine parts warehouse. 30-day returns on unopened, unused items. Review our Refund Policy for full details.
Key Facts
- Part Number: 8M0078015
- Viscosity: SAE 85W-90
- Type: Racing / Extreme Performance marine gear lube
- Bottle Size: 1 quart
- UPC: 745061915206
- Benefits: Wear protection, heat stability, and resistance to water intrusion
- Category: Oils & Lubricants › Gear Lubes
What’s Included
- 1 × Mercury Racing (Extreme Performance) Gear Lube 85W-90, 1-quart bottle (8M0078015)
Service Notes
- Service per your manual: fill from the drain until oil exits the vent; install new drain screw seals and torque fasteners to spec.
- Use a compatible gear-lube pump for clean, complete fills; verify thread size for your gearcase.
- After filling, run briefly, recheck level, and inspect for leaks; dispose of used lubricants responsibly.
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
4.5 ★★★★★
Based on 2018 reviews
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Product Reviews
★★★★★ 5
Trimmer
Works great
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 26, 2025
★★★★★ 5
Good for household use.Even my wife likes it!!
Good product.I had one previously that lasted for years.I like the lightweight and power is more than adequate!
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Reviewed in the United States on June 7, 2025
★★★★★ 5
Quick, powerful, and easy to use
Style: 2 x 2.0Ah
When my wife and I bought our latest home, I got bitten by the battery-powered lawn equipment bug. Because our lawn is a lot smaller and flatter than our last home, I refrained from having landscapers regularly maintain this new lawn. This means I now have every piece of equipment one could possibly want to keep our yard looking beautiful
Before purchasing this last item for our lawn, I was using a weed whacker to do the edging. This was tedious and not very precise. Because I have all Greenworks-branded equipment, this edger was a no-brainer.
Even though most of our battery-operated lawn equipment uses 60v batteries, I opted for this smaller dual-battery setup to save a little weight and money. Because of the small battery sizes, the edger is perfectly balanced and not one bit unwieldy.
I am able to quickly clear all of our sidewalk, lanai, and driveway surface edges within minutes.
Up to this point, I had never used an edger before. It literally took less than 30 seconds to get it buzzing correctly along the surface edges of our property. If not trying to do a large commercial area, this edger will probably work for most residential applications. Quickly and easily.
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Reviewed in the United States on July 24, 2025
★★★★★ 5
It's a beast and you can add attachments to, like a brush cutter head.
Style: 16" (2 x 4Ah)
This thing is a beast of a battery powered machine. I wouldn't put it completely up against my gas. It is much better than the Greenworks 24V 13-Inch Brushless String Trimmer (Gen 2), 4.0Ah USB Battery and Charger Included that I had purchased this time last year. I have several gas so I only really needed a light duty one to do the fence line and around the house. The main issue with the 13 inch was that the auto feed bump mechanism was worthless. It also uses very thin lines so very quickly you go from 13 inches to 6 to 8. and the bump feed does not work even with greenworks replacement spools. You get twice the batteries and a dual rapid charger for $50 more. You couldn't even buy the battery for that much.
onto this thing. Love the dual string heavy-duty string mechanism. Love the fact that you can remove the trimmer head and add an attachment. I have attachments from my gas Trimmers and they work perfectly. My brush head attachment utterly devastated thick bramble from an overgrown lot. The best part is it took me two hours to get my stored gas trimmers to run properly which I don't have to do with a battery operated device. No gas flying that deteriorated or primer bubbles that have burst followed spark plugs Stale gas . Just throw the batteries on and you're off.
Nothing long-term to report, only had it a week. Used it enough to run down completely six sets of batteries.
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Reviewed in the United States on April 30, 2026
★★★★★ 4
Works well, but battery life is lacking
Style: 15" (2 x 2Ah)
This is a decent trimmer and gets the job done almost as well as a gas model. It has decent power (could use a little more) and is plenty light.
However, the battery life stinks. One of the two batteries has already decided not to charge. It plugs in, but the charger does not blink or charge it. The terminals are clean.
Of course, this happened just outside the return/support window, meaning I now have to buy a new battery just to use the trimmer. That's about half the price of the trimmer; if the other one dies, too, I may as well buy a brand new gas trimmer for the price and have the thing last for a decade or two like my last one, instead of a couple years like this one.
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Reviewed in the United States on September 6, 2023
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