MTD Engine - Series 350/450/650
5
• The regulated blade tip speed is a safety fea-
ture. A dealer who puts a mower back into ser-
vice with a defeated safety feature may be
subject to liability if damage or an accident
occurs.
5.8. Oil type and capacity: See Figure 5.8.
• SAE 10W-30 SF/CD API rating for most operat-
ing conditions up to 97 deg. F. (36 deg. C.)
• 17.0 - 20.3 fl.oz. (0.5 - 0.6 liters)
• Insert but do not thread-in dipstick to check oil
level.
• The oil level is determined by the lowest point on
the dipstick that is completely covered with oil.
5.9. Special notes on oil:
• Check the oil level more frequently and change
the oil more frequently in severe operating con-
ditions such as high ambient temperature, dusty
conditions, or high load use in exceptionally thick
or tall grass.
• Synthetic oil may be used, but it does not extend
service intervals because the engine oil is not fil-
tered.
• No oil additives or viscosity modifiers are recom-
mended. The performance of oil meeting the SF/
CD specification will not be improved by the
addition of any commercially available products.
• Some oil additives may cause severe and non-
warrantable engine damage, constituting a lubri-
cation failure.
Figure 5.8
Insert but do not thread-in
dipstick to check oil level
5.10. Oil can be drained by removing the drain plug
located at the base of the filler tube / dipstick
tube, using a 10mm wrench. See Figure 5.10.
• Replace the drain plug sealing washer with a
new one to ensure that it does not leak.
• Tighten the drain plug to a torque of 84 in-lb. (10
Nm) on installation.
5.11. Alternatively, the mower may be tipped on its
side and the dipstick removed to drain the oil into
pre-positioned drain pan. See Figure 5.11.
CAUTION: Disconnect the high tension lead
from the spark plug and ground the lead before
doing any work that exposes the blade.
NOTE: If the oil is noticeable thin, or smells of
gasoline, carburetor repair will be needed before
the engine can be safely run.
Figure 5.10
Base of dipstick tube
Aluminum sealing washer
Drain Plug
Figure 5.11
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