Transmission Question

i would not use gear oil. gear oil would be much heavier than the recommended 10w/30 oil.

the heavier oil probably would play havoc with the transmision, and very likely damage something. i have always just used the recomended oil (the same as the engine uses) and in 14,000 + km, had zero problems.

jason

Why would you bother to use what the manufacturer recomends? What do THEY know about whatever it is THEY wrote the book on? It's much better to take the word of "someone on the internet." :roll:

Sorry for the smart ass answer, but the manufacturer prints an owners manual for a reason. (This come up on the bass boat boards all the time too.) They design the thing, they make the thing, they will have to pay for it if they give you bad advice about what kind of oil to use in the engine or the transmission and so on. Use what they recomend and you're safe on that score.

I tend to think they go overboard selling "routine service" but that's MY decision to ignore that. If something happens, I'll have to pay for that. I've never had to before with a car or a boat. We'll see with a motorcycle.

I use olive oil :lol:

Use what the Manual says.

I use Mobile 1 75W80 gear oil. An 80 gear oil is nearly the same viscousity as a 40 motor oil at room temp.
Paul

I use 10/30 synthetic. Gear oil is too heavy.

" Looking at my owners manual, I see it recommends 10w30 motor oil in the final transmission case. "
In this sentence, I believe you answered your own question :? I'd imagine looking further in the owner's manual it would also advise the recommended intervals on changing the tranny oil. :idea:

Considering I can also use 10W30 for the engine, I just use one oil for both (Mobil1 EP 10W30).

Where is this final tranny you guys are talking about? You mean at the rear tire right? There isn't anything between the engine and rear tire that needs oil right? I'm freakin' out here.

I think he's talking about the final drive. A little more than just a quick scan of the manual might be in order. :roll:

I had been calling it the final drive, then noticed that the owners manual calls it the final transmission. See page 6-17 (58 of 102 in PDF version) of the owners manual for how to change the final transmission oil, and page 8-1 (87 of 102) for type and amount of oil.

martinpd said:

I use Mobile 1 75W80 gear oil. An 80 gear oil is nearly the same viscousity as a 40 motor oil at room temp.
Paul

Click to expand...

I just searched for Gear Oil vs. Motor Oil on google and found the following at rec.autos.makers.honda:

"Gear oil viscosity is measured at 150 F vs. 210 F for motor oil.
Therefore, 40 W motor oil is the same as 95 W gear oil.

"Gear oil is acidic, motor oil is alkaline. Gear oil needs very high wear
protection - Extreme Pressure (marked as EP). Therefore, it has a very high
sulfur and phosphor content. Sulfur and Phosphate reactions start at a
lower temperature, and Gear Oil has much more additive than motor oil. This
additive is corrosive to copper bearings and bronze synchro rings."

Click to expand...

This suggests there are very good reasons to recommend either gear or motor oil, but not both. I assume that the final transmission on the Majesty either runs at a temperature too high for fulfur and phosphor additives, or the oil needs to be alkaline instead of acidic. I would worry about using gear oil because of these differences. I can't find any corroboration of the above, but until I find more info, this makes me nervous about gear oil in the majesty.

Yea, that's what I thought as my Vino was identical. There is only a belt between the engine and final transmission thats on the rear tire. Man I read that when I was tired and I was like, what in the sam hill are they talking about?

And FYI, I have the service manual and have studied that. However, I am still very much a newbee and figured I'd overlooked something in the final drive area. Thank god I didnt.

waterinthefuel said:

Yea, that's what I thought as my Vino was identical. There is only a belt between the engine and final transmission thats on the rear tire. Man I read that when I was tired and I was like, what in the sam hill are they talking about?

And FYI, I have the service manual and have studied that. However, I am still very much a newbee and figured I'd overlooked something in the final drive area. Thank god I didnt.

Click to expand...

When I suggested reading the owner's manual, I was referring to the original post, not yours.

Great discussion ! You guys just answered a question I wanted to ask. Thanks.

Duckie said:

Great discussion ! You guys just answered a question I wanted to ask. Thanks.

Click to expand...

As you found, many questions have been asked and answered and are available with a quick search.

Glad the forum could help you!

BTW, Yamaha no longer makes 10/30 oil. The dealerships say the 10/40 is fine. I hope so.

You cannot buy 10/30 Yamalube anymore? I hope 40 is ok also..