ARCO M525 MerCruiser Tilt & Trim Reservoir Kit – Replaces 18525A1
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You have 30 days to request a return. All sale items are final sale.
ARCO M525 MerCruiser Tilt & Trim Reservoir Kit
Restore your MerCruiser tilt and trim system with this complete reservoir replacement kit from ARCO. The M525 is a direct replacement for MerCruiser OEM part 18525A1, designed to fit the ARCO 6275 tilt motor. Everything needed to replace a leaking, cracked, or deteriorated reservoir is included in the kit — no sourcing individual components separately.
What’s Included
- Hydraulic fluid reservoir
- Reservoir cap
- O-ring
- Mounting screw
Key Specs
- Fits: ARCO 6275 tilt motor
- Replaces OEM: MerCruiser 18525A1
- Part Number: M525
Parts Desk Insights
Best suited for MerCruiser stern drive owners dealing with hydraulic fluid loss from a failing tilt/trim reservoir. This kit addresses the most common reservoir failure points — a cracked reservoir body, a deteriorated cap seal, or a hardened O-ring — in a single purchase. Confirm your application against the ARCO 6275 motor fitment and the OEM cross-reference (MerCruiser 18525A1) before ordering, as reservoir kits are motor-specific. If you’re unsure which reservoir kit fits your setup, also see the ARCO M532 MerCruiser Tilt & Trim Reservoir Kit, which covers the 4-screw mount variant of the ARCO 6275. Keeping a spare reservoir kit on board is good practice for extended cruising or offshore use where sourcing parts quickly may not be possible.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.