which oil???

[TacMedic6876]

Which is the best synthetic oil to use? I have heard that the Valvoline extreem is the best I have heard that AMSOIL is the best. What should I use? I changed my oil at 5000 miles wit the regular 15 40 valvoline oil and I am getting close to 10,000 miles and ready to change it again. Please help... .

 

[Bernie]

Valvoline

I have used Mobil One for years in my gas engines (race and street cars). It is amazing stuff. A friend recently had a cooling system fail in his race car. He is an engine builder, and after doing a tear down he credits the Mobil One for getting him through.



I have been using the Valvoline Premium Blue (15W-40, dino) in my CTD. Per Cummins the first 20k miles should be run on dino oil. I beleive this is the same product that is sold as the "Mopar" brand of oil for the CTD.



However, I will be turning 20k miles on my 2006 CTD next month. Then I will be going with the Valvoline Premium Blue Extreme (full synthetic, 5W-40). It was engineered by Valvoline with input by Cummins, and meets their new low sulfated ash requirement. It also costs less than many of the other synthetic products. For my money, it doesn't doesn't get any better than having a product designed with Cummins engines in mind.

 

[coobie]

Which is the best synthetic oil to use? I have heard that the Valvoline extreem is the best I have heard that AMSOIL is the best. What should I use? I changed my oil at 5000 miles wit the regular 15 40 valvoline oil and I am getting close to 10,000 miles and ready to change it again. Please help... .

Do a search and read until your head hurts,LOL, I have recently switched to schaffer 9000 full syn. from chevron delo,very happy so far. coobie

 

[d90boy]

Read the bobistheoilguy.com forums to make an informed decision. You can spend hours both here and on those forums seeking the "best" oil. Like coobie says Schaeffer 9000 is a good choice.

 

[RobertP]

cant go wrong with amsoil either Oo.

 

[MMeacham]

Schaffers Oil

I have used Schaffers in my truck since 25,000 miles and loving it!!!

 

[Whiskey]

cant go wrong with amsoil either #ad

What He said#ad


whiskey

 

[amsoilman]

Which is the best synthetic oil to use? I have heard that the Valvoline extreem is the best I have heard that AMSOIL is the best. What should I use? I changed my oil at 5000 miles wit the regular 15 40 valvoline oil and I am getting close to 10,000 miles and ready to change it again. Please help... .

There are many good oils out there, some better than others. If the oil you choose meets the API specs. of CI-4+/SL as well as the Cummins CES 20071, 20072, 20076, 20077, 20078 specs. you will be OK. The newer oils that will be required for the 07' model years will have to meet more stringent requirements, such as API CJ-4, and the new Cummins spec is Cummins CES 20081.



The Amsoil oils will exceed these specs.



Your choice,



Wayne

amsoilman

 

[GAllen]

I broke it in with Delo 400 dino and just switched to Rotella synthetic at 35,000 miles. I only did it because I thought the 5W versus the 15W would flow through the engine a little quicker. Most would say this is a complete waste of money in Southern California, and their probably right.

 

[DaveHess]

I was running Rotella T 15w-40 dino but changed over to Mobil Delvac 1 at 30,000 miles. No complaints. I have noticed a drop in fuel mileage but it also getting cold here and maybe it's the newer fuel. Anyhow, just my . 02.

 

[CATCRACKER]

left rotella for delo 400. . this thread is not helping much is it

 

[Buffalo]

HarrisC.



There are a number of things to keep in mind when choosing a motor oil. Where you live? How much driving you do? Towing commercially & heavy?, Etc.



If you live in a cold climate, the 5WX40 may be a good choice.



If you do a lot of driving, the advantages of extended oil drain intervals, that a synthetic offers, may apply to you.



If you tow heavy, the synthetic may be easier on your engine & allow you to go further without changing the oil.



If you are going to change the oil every 5000 miles, like you seem to be doing, you will be throwing out good, expensive oil if you go to a synthetic. In that case, a conventional (dino) oil will work well, for you.



There is nothing wrong with conventional oils. Many of them have very robust additive packages that allow them to live a long, useful life protecting your engine. There are Cummins engines "floating around" with well over a million miles on them, without a rebuild, using conventional oils & reasonable oil change intervals.



Personally, the last two oil changes I did were at the 8000 mile interval. I did used oil analysis & the results showed the oil was still in good shape. I'm thinking of extending the next change to 9000 miles, test, & see what the results are. This was with Chevron Delo-400, 15wX40, CI-4 &, CI-4+ on the last change.



The Delo has a very nice additive package that, now, includes moly & boron, which, add a protective layer on the metal surfaces of the engine. They started that with the newer CI-4+ rated oils & you could see the moly & boron in the analysis. Also, Delo is available at Costco, Sam's Club, Walmart, etc. , usually at reasonable prices.



From the reading that I've done, you will get the biggest "bang for your buck" with synthetics if you do a lot of hard driving, as in commercially, towing trailers, etc. If you combine an oil bypass filtration system, along with a quality synthetic oil, & used oil analysis, you will be able to do extended oil drain intervals, safely.



Remember, if your engine is still under warranty, you still have to follow the manufacturers guidelines for oil change intervals. (Some say that if you can prove the oil is in good condition, through analysis, you don't have to follow the manufacturers guidelines but, I'm not so sure. )



Another consideration is that, if you "just feel better" about using a synthetic oil in your engine, even though it probably does not need that much protection, & the extra costs won't hurt your wallet, then "go for it".



Good Luck, with your decision.



Joe F. (Buffalo)