Yanmar 2GM20 Oil

[vyv_cox]

This just means it meets the requirements of all three specifications.
By default, it will meet most of the lower specifications too.

If you look at the three specifications you will see that that is not strictly true. API CI has a low TBN to cater for reduced sulphur levels in fuel, whereas the other two do not. It depends on the maker but there can be a difference of 4 or 5 between the grades, which is higher than the overall figure for my recommended oil API CD.

 

[vyv_cox]

Duplicate

 

[Daverw]

Just been to Halfords and they have this oil on the shelf, is this suitable? 20W50 API SE CC

 

[PaulRainbow]

Just been to Halfords and they have this oil on the shelf, is this suitable? 20W50 API SE CC

No, it's 20w50 not 15/40 (Too high a viscosity)

 

[PaulRainbow]

If you look at the three specifications you will see that that is not strictly true. API CI has a low TBN to cater for reduced sulphur levels in fuel, whereas the other two do not. It depends on the maker but there can be a difference of 4 or 5 between the grades, which is higher than the overall figure for my recommended oil API CD.

Yanmar say that CG-4 or CH-4 might cause excess valve gear wear due to an additive.

 

[JumbleDuck]

No, it's 20w50 not 15/40 (Too high a viscosity)

In case it helps, here is the relevant section from the manual:

 

[Daverw]

Finally manage to find 15W40 CC for £15 for 5 litres

 

[vyv_cox]

In case it helps, here is the relevant section from the manual:

If that manual is like mine it could be at least 18 years old. I dont know about other companies but Shell use the same names for products that might be very different a few years down the line. Rotella for example is very different now from its previous version. Check the spec., not the name.

 

[JumbleDuck]

If that manual is like mine it could be at least 18 years old. I dont know about other companies but Shell use the same names for products that might be very different a few years down the line. Rotella for example is very different now from its previous version. Check the spec., not the name.

No date that I can see on it, but probably 1986, when the engine was supplied. I posted it because discussion had turned to viscosities. Yanmar's own oil nowadays is 15W40, but as far as I can see is "API CI-4/CH-4/CG-4/CF-4/SL o>ACEA E7-04/E5-02/E3-96/A3-02/B3-98" and may therefore not be suitable of the GM series. As the Australian distributor for Yanmar says ...

 

[sailorman]

What oil should i use on my CQR pivot pin ?

Genuine CQR oil, as manufactured In Scotland

 

[lw395]

If you look at the three specifications you will see that that is not strictly true. API CI has a low TBN to cater for reduced sulphur levels in fuel, whereas the other two do not. It depends on the maker but there can be a difference of 4 or 5 between the grades, which is higher than the overall figure for my recommended oil API CD.

I don't believe API Cg or Ch speicify a maximum base number.
It is in some JASO and ACEA specs though IIRC.