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Old August 11th, 2017, 07:05 AM   #31
RSL
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Mobil 1 4T is a bit lower viscosity than the Shell 10w-40 and a lot lower than the Shell 15w-15 viscosity. I would pass.


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Old August 11th, 2017, 07:10 AM   #32
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On another thread it was pretty much determined that everyone is changing their oil 2-3x the manufacturer specs. Pretty sure any motorcycle synthetic will fit the bill.

I'm using 20-50 lucas because it was priced nicely on amazon - it's a hot summer. In cooler weather I go to 10-40.
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Old August 11th, 2017, 07:24 AM   #33
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I'm reading George Morrison's discussions about viscosity again. How racing has taught us that with full synthetic oils engine output increases as viscosity is reduced. That a thick oil will increase drag on engine internals, robbing a lot of horsepower.

He was not a fan of using any 50 weight oil.

That said, what I'm looking at is the 40 weight viscosity at operating temperature. With the new Shell oil specified the viscosity is 19.9.

The 10w-50 Amsoil dirt bike oil has a viscosity of 18.1, thus the protection of a 50w synthetic oil but less rotational resistance than the 19.9 viscosity of the Shell 40 weight synthetic.

As we have seen in the ASTM tests, what viscosity is shown on the label doesn't mean that is the reality.
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Old August 11th, 2017, 07:28 AM   #34
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Foaming is a very serious matter for engines with a gears that share the same lubricant as engine oil.

A prudent purchaser would avoid any oil that foams during operation.
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Old August 11th, 2017, 08:13 AM   #35
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OK, the last clear statement on viscosity target for the little Ducati.

The range of viscosity we all need to stay within.


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Old August 11th, 2017, 08:36 AM   #36
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Old August 11th, 2017, 09:12 AM   #37
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My research is usually far more than most are interested in. That's fine.

Many report that they have good experience with this oil or that. Good as in no problems. Well, there are only two obvious problems one could experience with oil: 1) Clutch operation or 2) Engine failure.

My desire is for the best engine protection at an affordable price. That's why I spend time every few years comparing ASTM test results and actual specifications.

All things considered, it would either be Amsoil or Mobil 1.

Since I buy Amsoil at wholesale prices, I'll stick with it for the Ducati too. Especially considering that their EaO oil filter is light years better than any other oil filter.
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Old August 12th, 2017, 07:42 AM   #38
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Quote:
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Mobil 1 V-Twin 20w-50 meets the 15w-50 Shell viscosity specification. Probably available at a discount at Walmart too.



I was literally just going to ask you about the Mobil 1 V-Twin 20w-50. Could it hurt?


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Old August 12th, 2017, 09:56 AM   #39
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I was literally just going to ask you about the Mobil 1 V-Twin 20w-50. Could it hurt?
20.8 operating temperature viscosity is high. Above the top Specification viscosity.

I wouldn't that.
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Old August 12th, 2017, 04:51 PM   #40
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I'm going for the middle of the viscosity range, or a bit below.

One 10w-40 and two 10w-50 = 16.8 viscosity. More horsepower then the 19.9 viscosity and more protection than the 14.2 minimum viscosity.
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