Synthetic Oil

[dmccarty]

Well okay then. Give me the top three synthetics you suggest for my 4520 JD....I want to switch to synthetic on my next change.

I have run two synthetics in the JD4700 and my F350, Shell 5Wx40 and JD 0Wx40.

At one point, the JD oil from the dealer was cheaper in a 5 gallon bucket than 5 gallons of Shell oil from WallyWorld. The JD oil is now more expensive but about the same price as Mobile 0Wx40 oil. That is expensive oil.

I might run the JD oil one more time, but if the price stays high, I will go back to Shell.

Later,
Dan

 

[brucew44guns]

Apparently you are not doing any real work with it

Here are some basics which I think get missed with synthetic oil. It never breaks down and never loses its viscosity like Dino oil. But it does get dirty. So you must change your filter just as often...but theoretically you would never need to change your synthetic...given you have to add some back in with filter change it would gradually be changed.

Synthetic oil, even the Ams Oil products, the Mobil Delvac 1, and other reputable synthetics can change viscosity after it's in service. Soot contamination, condensation, oxidation, dirt, --those things can change viscosity. The large trucking companies running synthetic do change oil, they don't run it forever. Changing a typical filter out and replacing a pint or quart of oil would hardly be the same as an oil change even if it was done every once in awhile. Synthetics are fantastic performers, but can't do the impossible.

 

[Soundguy]

Cummins recommended oil:Valvoline.com > Products > OEM Endorsed Products > > Valvoline Premium Blueｮ Diesel Engine Oil

that's the one I like.. I use it in my 7.3 PSD's

29$ per gallon or so...

 

[PoorPlowboy]

that's the one I like.. I use it in my 7.3 PSD's

29$ per gallon or so...

Woah, are you sure? I think its around $12 and some change at my local Walmart.

 

[ham]

So is there such a thing as a Royal Purple Diesel Oil, or is Royal Purple simply good enough to use as is?

 

[Soundguy]

Woah, are you sure? I think its around $12 and some change at my local Walmart.

the valvoline premium blue FULL SYN 5w40 is 29$.. the regular non syn dino 15w40 is around 12$

soundguy

 

[jimgerken]

Regarding oil coming out black or not: In addition to the oil being a factor, I get the feeling that some engines are tighter than others, or wear in with better tolerancees eventually, and so are less prone to the blow-by that normally causes some of the dark oil issue. Of the three JD (Yanmar engined) tractors I have had, one was exceptionally clean all the time (the 2520). The 4100 was not a clean engine, and had dark oil all the time. The present 3720 had dark oil for the first couple fills but has cleaned up somewhat as the hours added up. All three engines were broken in on JD breakin oil, with a second fill of JD breakin oil, then switched to Ams diesel synthetic. I don't have it figured out, but these are my observations, FWIW...

 

[Soundguy]

and compaired to a gas engine.. diesels just generally soot their oil and darken it much faster than a gasser 'browns' their oil.

soundguy

 

[sw03]

and compaired to a gas engine.. diesels just generally soot their oil and darken it much faster than a gasser 'browns' their oil.

soundguy

True on that alone but alot is on what oil is used.

 

[Soundguy]

filtration too.. especially if there is a particulate filter..

soundguy