25w50
 

Ordered some of this mystik oil to try this year. Looks like 25w50 is making a home in the marine market?

https://www.mystiklubes.com/do/produ..._PWC/663097002

https://www.wholesalemarine.com/merc...-outboard-oil/

https://www.jamestowndistributors.co...t.do?pid=63748

Merc has Citgo make some of their oils so I would bet that the 25 w 50 is very close if not the same. Sierra does not use Citgo to formulate their oils.

Citgo owns Mystik as mentioned up here before. And Citgo has been making oils for the marine side for many years. Including 2 stroke oils

I run their gear lube, might as well try their engine oil too

still rather run a full synthetic,,this hasn't let us down in 12 yrs,not gonna change now.brought to you by walmart permformance.:D

https://www.walmart.com/ip/Mobil-1-2...&wl13=&veh=sem

Im a cheap azz. Got the mystik online for 55 bucks a case.

The mystik gear lube at farm and fleet is 65 bucks for a 5 gal pail (like 100 bucks at oreillys auto). Between the speedmaster drives, and the 11 qt per engine oil, using the fancy synthetic fluids, it costs me 500 to change drive and engine oil, vs 175 for the mystik stuff.

I hear yeah.

Motorcycle oils are made for gear synchronization and allowing some friction for the internal clutch packs - many people in the bike world have had clutch slippage issues when using medium to high base moly formulated oils in their motorcycles. (Basically in laymans terms engine oils that are too slippery)

There is a reason that a bike is pictured on the bottle. I understand u have not had a failure using this motor oil but most likely would not have any failures with straight 40 w bought under the O Reilly's name either. Current Motor oils is not the primary factor of engine failure anyways. overheat, detonation, poor fuel and or fuel systems issues, dirt, lack of maintenance - totally wrong motor viscosity, and so on are. the root of engine failures. Just my 2 cents

In particular around 2005 when slipper clutches came on the scene in motorcycles we had to revert back to the dinosaur oils until they added friction modifiers into the synthetics.

5-6 sets of 1200hp blower motors says,,I'll buy that for a dollar.and there not some 1 season wonders either.
that oil took care of a heavily boosted 496 gen 7 engine that was still closed cooled,,oil pressure would go down to 5ishlbs.twin v and oil never went below 35.btw,they were the first engines in the 47 excaliber(all 23k lbs of her).if that was ever a torture test,nothing is.its new 4l whipple 581's run that oil too.just my 10 cents.

I have a list of MSDS sheets of many of Merc's products which show the manufacturer :)
I posted this elsewhere:

Cenpeco racing oll.

10-4 on the above. Don't use Rotella Semi-Syn in a motorcycle!!! Do use the Full-Synthetic though, go figure as it doesn't have the moly the semi does. Used full for years in multiple wet clutch road racing motorcycles with and without slipper clutches and without issue. Used Semi in a dry clutch bike, no issue.

Since we know 25w50 is 50 weight at 212* The question is what is viscosity at 180* where most of us run . Probably less that 50weight .
So if I want 50 weight protection the only way would be to use a straight 50 weight oil. Right? Otherwise at lower temps it could be 30weight..

https://www.youtube.com/watch?v=K8E_zMLCRNg

LOL.
No crickets here, but lots of peepers and just as annoying. Few thousand around me that won't shut up right now. LOL.
https://www.youtube.com/watch?v=dy1z7WU8kQ0

maybe a few rounds of .45 might shut them up?

Your hearing cricket sounds because maybe nobody on here can answer your question with 100% certainty.The first number of a multi viscosity oil followed by a "W" means winter viscosity. The W does stand for winter. This portion of the viscosity grade is determined at a very cold temperature. I am not sure what that temperature is, but, I'm pretty certain it's well below zero. So, in your case the 25W pours like a 25 viscosity at say 0 degrees. You are correct that the second number, in this case 50 is measured at 212F. So, here is where it gets confusing. As the temperature of the engine oil increases, the viscosity decreases, and vice versa. So, that being a true statement, which it is, could lead you to believe the oil is thicker at 180. I don't know the answer.

my cricket hears FLOW RATES.

Haha. Your cricket needs to be a bit more specific than that.........FLOW RATES doesn't answer the question as to what the weight of the oil is at 180 degrees.

Some of those changed currently as that was 10 years ago. Merc now makes it a point to have their name on the MSDS sheets without listing the true manu.

Got to love the snake oils and all the alcohol in the gas additives -- many OEM marine fuel additives contain a from of alcohol. Merc above MSDS has ---- Isopropanol in the mix is the main component 95 %

https://www.reference.com/science/is...59c654aac896eb

Great what happen to the calls for Valvoline VR1 20w-50 Racing oil..... now I am going to have drain my engines and put something else in them. Drain my outdrives because that changed too quicksilver gear lube is no longer the good stuff and now thanks to BUP I have to drain my fuel tank that I just filled up because of an addtive I put in it. Next winter I am just going ot leave everything emtpy until spring when you guys make up your minds on what I should be running. Thinking that might save me a few coins in spring of 2018.:)

One thing I didn't think of until now is I have Mobile one filters and Valvoline oil in my motors I better get those filters changed (probably to Fram) because I am sure Mobile and Valvoline are not compatible.

Here:
http://www.kewengineering.co.uk/Auto..._explained.htm

I use what works.even if I only change it 2 or 3 times in a decade.:D

I think its more of a viscosity vs temperature thing. Cooler the temperature, higher the viscosity.

The viscosities at 104*
15w50 mobil = 125 CST
5w50 mobil = 108 CST
10w30 = 77 CST
20w50 = 181 CST
straight 40 = 136 CST
straight 50 = 219 CST

At 212*
15w50 mobil -= 18 CST
5w50 mobil = 17.5 CST
10w30 = 11.5 CST
20w50 = 20.5 CST
straight 40 = 14.5 CST
straight 50 = 20.0 CST

Pour points.
10w30 = -27.4* F
Straight 40 = -16.6 * F
Straight 50 = -0.4 * F
20w50 = -11* F

A straight 40 grade oil, has less viscosity at 104* temp, than a 20w50 , and pours to a colder temperature, than a 20w50? Mobils 15w50, seems to have ALOT less viscosity at 104*, than a VR1 20w50.

You use Mobil 1 Vtwin - it is loaded hard with phosphorus and zinc. It is also designed for engines (Harley of course) that are air cooled and thus encounter major oil temps.
Go to the bottom of: https://mobiloil.com/~/media/amer/us...pecs-guide.pdf

Don't kill the messenger for the fuel adds. There is one on the market that is straight ethanol and they use to market very heavily on the marine side. Yamaha branded fuel adds all went to non alcohol base products for the fuel systems. It has been known for the last 20 years that many fuel adds for the marine side was mostly alcohol based.

Maybe a good read for some and as I said before about inexpensive off the self diesel oils. Would not use them in a marine app currently. Their ZDDP levels have fallen greatly.

Just adding --- The 3.0 - 4 banger marine side still used Flat tappets and I can not tell you how many times I seen bad lobes on their camshafts from owners doing their own changes, Buying EPA mandated auto oils off the shelf.

FWIW below

http://www.enginebuildermag.com/2017...84&bid=1760177

On a serious note, the one that I use Star Tron Enzyme Fuel Treatment says it uses Kerosene. I use it really because it makes me feel better like I am doing something to help. Your favorite motors 496HO's 0W681083 and 0W681088 gen III cool fuel. I only fill up with 89 ethanol free. Only use 89 becasue I can get it without ethanol. Am I doing good / bad or no harm no foul?

yeah,,we figured that out along time ago,,when mobil started screwing w/ the 15-50 oil,red cap gold cap,,,just leave the good stuff in it.:D