Mercury 300R HD CMS Mechanical, Operation And Maintenance Manual, Page: 86 / 99

NOTE: It is not necessary to check the oil level immediately after changing the
oil. The engine must be run for a while and then turned off for one hour or
longer before checking the oil level. Refer to
Checking Engine Oil Level.
Checking Engine Oil Level
After the engine oil has been changed, the engine should be run for a few
minutes and then turned off, allowing one hour or longer before checking the oil
level.
IMPORTANT: For an accurate oil level reading, the engine must be vertical for
several minutes before removing the dipstick.
1. Remove the dipstick and observe the area of the five beads.
2. The bead or crosshatch which shows oil furthest from the end is the oil
level.
63468
Oil level example
DIPSTICK BEAD OIL LEVEL OVERVIEW
New oil (level) may be difficult to identify which is why the crosshatch between
the beads are part of the dipstick assembly. When checking the oil level, if oil is
on any of the five oil range beads or four crosshatch, the oil level is within the
safe operating range. When the oil level is only on the lowest oil range bead,
the operator can add 1.8 Liter (2 US qt) of oil and the level will remain within
the safe operating range. When the oil becomes dark from hours of product
use, it will be easier to identify the oil level on the dipstick.
IMPORTANT: Repeated removal and insertion of the dipstick to check the oil
level will subsequently deposit oil further up the dipstick tube which potentially
may cause an error reading the oil level.
a - Safe operating range
b - General area after an oil change
c - Add 1.8 Liter (2 US qt) of oil
c
a
b
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MAINTENANCE
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eng