Engine Oil Recommendations-500R; Checking And Adding Engine Oil - Mercury Racing 500R Operation And Maintenance Manual

The fuel demand valve has a manual release. The manual release can be used
(pushed in) to open (bypass) the valve in case of a fuel blockage in the valve.
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Engine Oil Recommendations—500R
Mercury Racing 10W‑30 MRX Full Synthetic Oil is the preferred choice for best
performance and general, all‑temperature use. Use Mercury Racing 25W‑50
NMMA certified FC‑W® Marine Synthetic Blend Marine Engine Oil if Mercury
Racing 10W‑30 MRX Full Synthetic Oil is not available.
If the recommended Mercury Racing FC‑W certified oils are not available,
a major outboard manufacturer's brand of NMMA FC‑W certified 4‑Stroke
outboard oil of the same viscosity may be used.
IMPORTANT: The use of nondetergent oils or multiviscosity oils (other than
Mercury or Quicksilver NMMA FC‑W certified oil or a major brand NMMA FC‑W
certified oils) are not recommended.

Checking and Adding Engine Oil

IMPORTANT: Inspect oil for signs of contamination. Oil contaminated with
water will have a milky color to it; oil contaminated with fuel will have a strong
fuel smell. If contaminated oil is noticed, have the engine checked by your
dealer.
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FUEL AND OIL
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Fuel demand valve ‑ installed in the
fuel hose between the fuel tank and
engine
Manual release
Vent/water drain holes
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