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Piaggio Liberty 150 s
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Will the dealer, or manufacturer, have issues with using 10w40 instead? The actual viscosity on the data sheet shows little difference in viscosity between 5w40, and 10w40(or in some cases lower. Their 10w40 mc oil actually has lower viscosity than their 5w40 mc oil)
AMSOIL's product recommendation is the 10w40 scooter oil
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Quite often, oil viscosity recommendations vary slightly based on temperature where you live.

The closer the two numbers are for oil viscosity, the less demands on a specific element of the oil and so the longevity of that oil is increased. A true 10w40 will be more stable long term than a 5w40.

What sort of riding do you do? If you're doing longer trips, and are in a hotter climate, the 10w could be ok. If however you only ride a few miles at a time, or through cold winters, I'd be tempted to stick with the 5w for lower wear on startups.

If you're concerned or interested about this long term, you can actually try both oils over a set time limit - send off samples to be tested and then get an exact print out on how they compare.
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Piaggio Liberty 150 s
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I know the 10w40 will be fine. I just wonder if the dealer, or manufacturer would do something like, deny an unlikely engine warranty because of it.
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How would they know?
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They've been running these air cooled engines for 10 years now, and they're extremely reliable - so this is a very very small risk, on the even smaller chance they discovered you'd used a different oil to their spec.

Main thing is making sure the valves are adjusted at 620 miles, and then every 2 years after that point.

Do you do your own servicing?
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Piaggio Liberty 150 s
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I can. I am a mechanic, but not for scooters. I'll likely take it in for the first service for sure. They are the specialist. I plan on changing my own oil though, because I find it satisfying. Going to use Amsoils 75-90 gl4 trans fluid for the final drive. Specs gl4 so, I'll use gl4
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Keep in mind that most of the people in the US who ride vespa scooters average 2-3000 miles a year, and a lot of the reports back that they've had no problems are from people with 2500 miles on a fairly new scooter. Many of these same people also believe that if they put in a different grade of oil the engine might blow up the first time you start it. The wear effects of different grades and qualities of oil don't show up until you are pretty far down the road. Although you can run the same bike with 5-40 and 20-50 through dyno runs and see that the heavier oil will make a bit more horsepower out of the engine.

5-40 started as an euro spec oil that the entire European automotive industry embraced,sort of like what the eu is trying to do with electronic charging cords. Meanwhile, in places that were hotter, like the Middle East they arecommended 10-40 and 15-50. Before Piaggio bought them, Aprilia used Piaggio engines and recommended 20-50. Oil specs are not for you or the machine, they are to compy with various government regulations. I have a fairly new Japanese car. In the US version of the owner's manual, it says to use 0-20. In the international version, they have the chart based on temperature and use, that goes up to 20-50 in some cases. Same car, same engine, different government regulations. So in the Frozen Tundra of Arizona, 0-20 is fine, but in the Australian outback or the middle east, where it gets hot, 15-40 or 20-50 is recommended for long engine life. Any of the three will get the car through the warranty period though.
If you ever have access to high mileage scooter engines, compare the camshaft and rocker arms on a 50k Piaggio engine to those on a 50K Genuine or any other well made air cooled scooter that didn't use 5-40 it's life. You can do the same thing with the liquid cooled bikes and see the same sort of excessive wear in the cam and rocker arms compared to similarly used Honda or Yamaha scooters that recommend oil weight based on climate and riding conditions. 5-40 satisfies various government requirements and will get the bike through the warranty period. What else matters to the manufacturer?
Piaggio bought Moto Guzzi, and switched their bikes to 5w-40. Three years and a lot of broken engines later, here's what they did
Forum member supplied image with no explanatory text
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JakeM wrote:
Main thing is making sure the valves are adjusted at 620 miles, and then every 2 years after that point.
I have to check my valves after 2 years and 800 miles? Why?
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Chachi13 wrote:
I have to check my valves after 2 years and 800 miles? Why?
Because you read it somewhere. You don't.
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Piaggio Liberty 150 s
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According to the shop manual. 10w40 is recommended in Asia 5w40 in Europe
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pg150 wrote:
According to the shop manual. 10w40 is recommended in Asia 5w40 in Europe
Which shop manual?

Here's a photo of the Vietnamese section of the user manual for a 2019 Supertech HPE
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⚠️ Last edited by SteelBytes on UTC; edited 1 time
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Because Sweden = Portugal and Vietnam = Siberia?
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Piaggio Liberty 150 s
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Liberty 125-150. Euro 4 though. Mine is euro 5
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pg150 wrote:
Liberty 125-150. Euro 4 though. Mine is euro 5
Sorry, forgot it was a liberty
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You know, these discussions are really pretty silly. It's like discussing the importance of the differences between choosing red or green when selecting a Fiesta Colors condom. Just pour some oil in it and go.
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Tor2ga wrote:
You know, these discussions are really pretty silly. It's like discussing the importance of the differences between choosing red or green when selecting a Fiesta Colors condom. Just pour some oil in it and go.
Red ones go faster. Everyone knows that
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SteelBytes wrote:
Red ones go faster. Everyone knows that
Yes, but who wants to go faster! ROFL emoticon
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pg150 wrote:
Liberty 125-150. Euro 4 though. Mine is euro 5
Can you please give that manual to jimc so he can stick it on the archive at https://manuals.wotmeworry.org.uk/Piaggio/
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pg150 wrote:
Liberty 125-150. Euro 4 though. Mine is euro 5
And post the next page please so we can see the European oil recommendation.
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Piaggio Liberty 150 s
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says 5w40 for Europe.
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