Originally Posted by Lubener
But wait, please wait,
there's no need for a 0w- oil in the summer time for a lawn mower.
No need but no drawback either. Mobil 1 0W-40 FS has a plethora of manufacturer approvals including Porsche A40 which demonstrates and proves it is a superior oil to just about any on the market - and the price at Walmart makes it a steal.
In fact, the truth is that the Mobil 1 0W-40 FS is probably a better grade for a lawn mower than it is for a snow thrower. A 40-grade oil is always going to be thicker than a corresponding 30-grade except at extremely low temperatures (and it doesn't snow at those temperatures), making it more difficult to start the snow thrower. Correspondingly a 40-grade oil provides better protection and higher MOFT to the air cooled lawn mower.
Overkill posted this a while back, it shows how a Porsche A40 approved oil is ideal for an air-cooled engine:
Originally Posted by Overkill
Here is Porsche A40 testing procedure:
This test will last 203 hours. The engine, and the oil, will go through:
- 4 times the simulation of 35 hours of summer driving,
- 4 times the simulation of 13.5 hours of winter driving,
- 40 cold starts,
- 5 times the simulation of 1-hour sessions on the Nurburgring racetrack,
- 3.5 hours of running-in program
Measurements on the engine and on the oil will be done at regular intervals, and the following parameter
will be taken into account to grant the approval or not:
- torque curve (internal friction),
- oxidation of the oil,
- Piston cleanliness and ring sticking,
- Valve train wear protection. Cam & tappet wear must be less than 10 microns.
- Engine cleanliness and sludge: after 203 hours, no deposits must be visible.
- Bearing wear protection: visual rating according to Porsche in-house method.