Oil weight

[Av8tor07]

Good Morning. I don’t want to start a discussion on oil brand, I know that I’ll be using Mobil 1. I just want to know what weight you guys recommend? 10-30, 10-40? When I google Mobil 1 10-40 it shows “for high mileage “ is this ok to use on our boats? I have the 1.8s. Thanks guys

 

[haknslash]

Be sure you get the correct grade as well.

From the owner's manual:

 

[Av8tor07]

I saw that buts it’s not really clear to me. It’s 10w-40 High mileage good? Or is there a Mobil 1 10w-40

 

[haknslash]

Personally I would not run any of the "high mileage" stuff as those have additives for those applications generally making them a higher viscosity. Just stick to the 'non-specialty' oil IMHO. 10w-40 is what I use for my climate.

FWIW Mobil does make a "regular" or conventional 10w-40. They call it "Super" but it's just their conventional blend. Most auto places tend to carry the Mobil 1 High Mileage blend or at least in my area.

 

[Av8tor07]

Personally I would not run any of the "high mileage" stuff as those have additives for those applications generally making them a higher viscosity. Just stick to the 'non-specialty' oil IMHO. 10w-40 is what I use for my climate.

FWIW Mobil 1 does make a "regular" or conventionalk 10-40w. They call is "Super" but it's just their conventional blend. Most auto places tend to carry the Mobil 1 High Mileage blend or at least in my area.

I see. So they do have a synthetic 10-40? What type of oil do you use?

 

[bronze_10]

I was going to ask the synthetic question.. My mechanic uses normal dino oil.. 10. 40

 

[Beachbummer]

I read somewhere the lighter weight oil actually flows faster and provides greater lubrication. I run 10w40 now as it was what the prior owner used. Looking for additional info to possibly validate or change the approach.

 

[haknslash]

I use regular 10w-40 dino oil from the Yamalube kits.

 

[Danielmailin]

As per @haknslash you stick to the manufacturer specifications, specially the Recommend engine oil grade API, these specifications should match with the oil you are going to use.
I believe the Mobil Super High Mileage was the closest one that meet these standards.
You do want to avoid energy efficient.

 

[buckbuck]

Wow. Those are very old API oil types. Even the cheap oil that I use is rated SN. I wonder why Yamaha wants us to use obsolete oil technology in their engines?

 

[druppert]

I’ve read that additives in high mileage oil causes seals/gaskets to swell & if used on a low mileage engine could lead to additional wear. The article suggested that while not necessarily a problem you shouldn’t go back to conventional oil after making the change. That was just one article & every person on earth has a different opinion on oil. I stick to engine mfg recommendations. I think they even recommend different weights based on your climate. I use 10W-40 here in FL

 

[haknslash]

Wow. Those are very old API oil types. Even the cheap oil that I use is rated SN. I wonder why Yamaha wants us to use obsolete oil technology in their engines?

I'm not sure why they have grades that are obsolete. http://www.pqiamerica.com/apiserviceclass.htm

What interesting to me is that on 4 star models they recommend only using the more recent API grades but on 3 star models they list oil grades going back over two decades. This is from my 2o16 owner's manual:

 

[Chief]

4 star engines have catalytic converters for better emissions...API SN oils have lower levels of ZDDP because the zinc and phosphorus will foul the catalyst....API SM oil is actually a better oil for metal wear protection because of the higher ZDDP levels.