Fuel And Oil Recomendations - Briggs & Stratton 272147 Repair Manual

FUEL AND OIL RECOMENDATIONS

Gasoline
Use clean, fresh, unleaded gasoline. Leaded gasoline
may be used if unleaded is not available. A minimum of
85 octane is recommended. The use of unleaded
gasoline results in fewer combustion deposits and longer
valve life.
We do not recommend the use of gasoline that contains
alcohol, such as gasohol. However, if used, it must not
contain more than 10 percent Ethanol and must be
removed from the engine during storage. Do not use
gasoline that contains Methanol.
Only purchase a 30-day supply of gasoline. Fresh
gasoline minimizes gum deposits and also will ensure
fuel volatility tailored for the season in which the engine
will be operated.
NOTE
: The use of a fuel additive, such as
Briggs & Stratton Gasoline Additive
equivalent, will minimize the formation of fuel
gum deposits during storage. Such an additive
may be added to the fuel tank or storage
container.
Lubrication
Oil has four purposes. It cools, cleans, seals and
lubricates. During normal operation, small particles of
metal from the cylinder walls, pistons, bearings and
combustion deposits will gradually contaminate the oil.
Dust particles from the air also contaminate the oil
forming an abrasive mixture which can cause wear to all
of the internal moving parts of the engine, if the oil is not
changed regularly. Fresh oil also assists in cooling. Old
oil gradually becomes thick and loses its cooling ability
as well as its lubricating qualities.
Oil Recommendations
Use a high quality detergent oil classified "For Service
SF, SG, SH, SJ" or higher. Briggs & Stratton strongly
recommends the use of synthetic oil such as Briggs &
Stratton or equivalent. If synthetic oil is not
(#100074)
available, Briggs & Stratton non-synthetic 30 weight oil
is an acceptable substitute. No
(#100005 or #100028)
special additives should be used with recommended oils.
Do not mix oil with gasoline.
Page 6
Vanguard
SAE Viscosity Grades
CAUTION
viscosity oils (5W-30, 10W-30, etc.) in
temperatures above 405°F (45°C) will result in
higher than normal oil consumption. When using
a multi-viscosity oil, check oil level more
frequently.
SAE 30 oil, if used below 405°F (45°C), will
result in hard starting and possible engine bore
damage due to inadequate lubrication.
or
(#5041)
Lubrication System
Briggs & Stratton Vanguard™ liquid cooled OHV V-
Twins use a full pressure lubrication system with an oil
filter. The gear driven oil pump draws oil from a screened
oil pickup and pumps the oil through the oil filter.
The filtered oil flows through oil galleries in the cylinder
and crankcase cover and is distributed through the
crankshaft to the main bearings and connecting rod
bearings. Engine oil pressure will vary with oil viscosity,
ambient air temperature differences, operating
temperatures and engine load. Follow the oil
recommendation shown above.
Oil Pressure - @ 705° F (215° C): 10 ~ 50 psi
A pressure relief valve limits the maximum oil pressure in
the system.
The engine may be equipped with an oil pressure switch
which may be used to activate a warning device if oil
pressure drops below approximately 8 psi (.55 Bar). The
warning device is supplied by the equipment
manufacturer.
TM
Twin-Cylinder OHV Liquid-Cooled Engine
Section 1 - General Information
: The use of non-synthetic multi-
(0.7 ~ 3.5 Bar)