Mercury 8M0187621 V6/V8 4-Stroke Oil Change Kit

Mercury-Mercruiser 8M0187621 V6/V8 4-Stroke Oil Change Kit 

This complete oil change kit is designed for Mercury 175-225 HP 3.4L V6 and 250-300 HP 4.6L V8 outboards. It includes seven liters of Mercury SAE 10W-30 synthetic blend engine oil, an OEM oil filter, drain hose, and instructions. The advanced formula delivers 33% better camshaft wear protection than competing marine oils and features superior corrosion inhibitors to guard against rust in wet environments and during storage. This kit provides everything needed for DIY maintenance following Mercury's recommended 100-hour or annual service intervals, helping maintain peak performance and extend engine life.

Mercury V6/V8 Oil Change Kit Includes

• (7) 1 Liter Mercury SAE 10W-30 Synthetic Blend Engine Oil
• (1) OEM 8M0123025 Oil Filter
• (1) OEM 8M0108358 Drain Hose
• Oil change instructions

Benefits of Mercury Marine Engine Oil

Why choose Mercury oil for your Mercury outboard? Mercury's 10W-30 engine oil is manufactured with new advanced corrosion inhibitors that outperform the competition and all industry standards. These inhibitors provide protection against rust and corrosion in wet environments and during off-season storage. Additionally, Mercury utilizes high-tech additive technology that results in 33% greater camshaft wear protection compared to other marine oils.

• Provides outstanding wear and corrosion protection
• Helps maintain peak engine performance and reliability
• Eliminates thermal breakdown under extreme rpm, temperatures, and loads

Mercury recommends changing your engine's oil and replacing the oil filter every 100 hours of use, or annually, whichever comes first.

Supersedes: 8M0169547

Frequently Asked Questions

What engines is this kit designed for?

This kit is for Mercury 175–225 HP 3.4L V6 and 250–300 HP 4.6L V8 4-stroke outboards. It's not intended for MerCruiser sterndrives or other engine families. Mercury offers separate oil change kits for those applications.

What's included in this kit?

The kit contains seven 1-liter bottles of Mercury SAE 10W-30 synthetic blend engine oil, one OEM oil filter (8M0123025), one OEM drain hose (8M0108358), and oil change instructions. Everything needed for a complete DIY oil change is in the box.

How often should I change the oil on my Mercury V6 or V8 outboard?

Mercury recommends changing the engine oil and replacing the oil filter every 100 hours of use or annually, whichever comes first. If your boat sits through a long off-season, the annual interval matters; oil accumulates moisture and combustion byproducts over time that can cause internal corrosion even when the engine isn't running.

Why use Mercury's own oil rather than a generic marine oil?

Mercury's 10W-30 synthetic blend is formulated for their engines, with corrosion inhibitors for wet environments and off-season storage protection. According to Mercury, it delivers 33% better camshaft wear protection compared to competing marine oils. Using the OEM oil also ensures you're meeting Mercury's factory maintenance specifications.

Is this the same kit as the previously sold 8M0169547?

Yes. The 8M0187621 directly supersedes part number 8M0169547. If you've ordered that kit before, this is its current replacement.

What's the difference between this kit and the Quicksilver 8M0169548 also sold on this site?

Both kits cover the same 175–300 HP V6 and V8 engines and include the same OEM filter and drain hose. The difference is the oil: this Mercury-branded kit uses Mercury SAE 10W-30 synthetic blend oil, while the Quicksilver kit uses Quicksilver-branded oil. Both are genuine Mercury Marine products. Quicksilver is Mercury's own aftermarket brand, so either is an acceptable choice for routine maintenance.

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