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The engine is a 2021 F20.

And more:

Sorry for late reply. Here is from the manual. No reference to FC-W over here in Europe.

I find it strange that API service grade SE is approved. It is a pre 1979 lube oil and as far as I know there were not any synthetic oils on the market then. Does it mean Yamaha approves a 1979 specced mineral oil in 2021 outvoard engines?

No reference to NMMA. Only SAE viscosity and API service grade. Sticker inside engine:

F20 HES

Yes I have no intension to not follow the Yamaha specs. I just want to understand why a brand new motor is recommended by the manufacturer to use oil technology that is 10-15 years old. I also wanted to challenge the API statement that newer/higher service grades always are backward compatible...

So is it reasonable to say that the newer API service grades which are designed for low ash in combination with particle filters, low emissions etc. have compromised away some of their additives (and in some ways are poorer looking isolated at lubrication performance only)?

The oil the dealer supplies is SJ. The sticker on the engine states SJ, SL.

Don't know. In the Owners manual it is stated SJ. But on the engine itself there is a sticker with SJ, SL.

Got a brand new Yamaha outboard The recommended oil is synthetic 10W-40 API SJ, SL I have trouble finding a Mobil oil (Mobil is what I use for my cars, the bigger boat with inboard diesel engine etc.) fitting this spesification without API service class SM and SN as well. I understand that...

The engine is MY2020 and has about 180 running hours, and the oil was changed at 150 hrs. The coolant temp of 75 C is the correct temp according to Yanmar. Yanmar marine are known for their low (set) coolant temp compared to other manufacturers.

I have a Yanmar 6LY 440 hp marine diesel engine. It is a 6 cylinder in line common rail with a displacement of 5.2 ltr. Max rpm is 3300. It is filled with 19 ltrs of Mobil Delvac MX 15w-40. I noticed that after longer periods of cruising at 70-75% load with a corresponding rpm of abt 2800 that...

I havent seen Clear Diesel here, but Hammerdown is quite popular. However, Hammerdown and most other additives which promises water to diappear does so by emulgating the into the diesel. But the water is still there and that is what I dont want into the fuel system. I then prefer the water to...

There is no way around the biodiesel over here. By law the distributors have to blend in minimum 2% biodiesel. If over 5% the pump must be clearly marked. What I get is somewhere between 2 and 5%.

Biocide is for killing bacterias. 2-stroke oil improves lubrication and preservation properties (I assume?).

I have a 2003 Windy Scirocco 32 with a twin Volvo Penta KAD300 installation. The fuel tank on the boat is of aluminium and 520 liters. I put the boat on shore from end of September to app. end of April and I leave it with a full tank to minimize condensation. I was first thinking of adding a...

Yeah, motoring is expensive on this side of the pond. I can however easily get some 40% discount on the MX oil. At leasthe it helps a bit. Any views from you experts about that mineral based oils sticks better and thereby is an better alternative for the 4-5 months lay up? Thanks again for...

Thanks to you to CT8. I found a Exxon Mobil reseller which had an up to date online price list: Mobil Delvac 1 5W-40 is $ 10,03 pr liter (before any discount) Mobil Delvac MX 15W-40 is $ 5,63 pr liter (before any discount) Another argument for staying with mineral oil I picked up on a...

Thanks a lot for valuable inputs.