What Amsoil products do and dont you use from them? Just curious, that's all.

 

IMO you cannot beat Valvoline Premium Blue Extreme. Endorsed and recommended by Cummins, full synthetic blend. Only oil i will EVER put in my truck and i'll swear by it until the end.

 

Just and FYI, make sure that you do not use synthetic blended 5w40 oil in the newer engines as it is not an approved oil by Dodge. This only applies to those who are still under a Dodge warranty.

 

I just switched yesterday to the Valvoline premium blue and a mobil 1 extended performance filter, truck has 112k, what do you think would be a safe change interval now? Do oil analysis?

 

Schaffer supreme 9000, fleetguard filter, amsoil bypass filter, fumoto drain, 20,000k changes
OH YEAH!

 

That's 20 million miles. Wow!

 

OK-- I got a little excited there... how about 20K miles or 20,000 miles

 

I already feel guilty for posting this. But most won't believe me anyway until they somehow check it out. There is almost no such thing as full synthetic anymore. What happened is science. The art of perfecting oil refining got so good, that modern mineral (petroleum) oil essentially matched the performance of real synthetics in all but the very lowest and very highest temperatures. Castrol started marketing their petroleum Syntech as a synthetic oil and was sued by Mobil. The courts found that the term synthetic was more a marketing term than a technical term and in 1999 found for Castrol. Today most "full synthetics" are a blend of mostly Group III petroleum oil with some Group IV and/or V real synthetic base. For example, Rotella T synthetic is 83% Group III petroleum base. Mobil-1 is similarly a blend of advanced petroleum and true synthetic.

Redline is nearly pure Group V diester synthetic. Amsoil used to be full (real) synthetic, but may have jumped ship to the "new" full synthetic. There are a couple others.

This doesn't mean all petroleum oils are similarly high performance. Group I and II oils are no better than they used to be, and "synthetic blend" often refers to blending Gp II and III. Not as good as "full synthetic" oils containing Gp III petroleum.

Personally I use Rotella-T synthetic on my CTD and don't worry about what's actually in it. I'm satisfied with the specs and the CI-4plus rating.

-- Bill

 

If the Cummins will run a million miles with Dino oil why would you pay the extra for synthetic?? You still need to get the dirty stuff out, no matter how "good" the oil is.


I just use good ole Shell Rotella T changed every 5k with a Fleetguard Stratapore filter. $8.88 a gallon at Walmart for Rotella.

 

i've been using purple for long time---not been able to find cheap ?

 

I switched from 15-40 to 5-40 rotella at 57500 to see if it would make any noticable difference. Easier cold starts, slightly better MPG (especially in the winter), and smoother running. I originally planned on running Rotella synthetic for the winter only but I am sold on the running it fulltime. As far as filters, my truck is all Napa Gold (Wix). 7620-oil, 2846-air, and 3585-fuel.

 

Synthetics hold their performance, particularly high temperature performance longer. I would bet your 5k-old drain oil has diminished viscosity compared to new. But at 5k it's probably well in the safe zone. But what if you screw up and change oil late? Or you tow heavy, or in some other way expose your oil to severe conditions? The incredibly few dollars difference between T and T Synthetic makes sense to me. To each his own.

-- Bill

 

Well I have over 270K on my '05 and I have been running Rotella 15w40 since the first oil change and so far no problem. My truck spends its life pulling heavy loads and runs non stop for days on end sometimes. So far I have not had any problems at all. I can't see spending the extra money for SYN. Just run good filters and change your oil often and take care of it and it will last!!

I also change my oil every 5-7K!

 

Bill, I don't disagree with you that Synthetics hold their performance longer than dino oils. But that dirty oil still needs to come out....synthetic or not.

That is why I do a 5k oil change. I have no doubt that even the dino oil can go 10k if it had to, but I am very **** about maintenance on my truck...so I won't "miss" my 5k interval... I do tow heavy, often, but not daily. I plan to send in an oil sample to Blackstone Labs soon after towing a GCVWR of 26,000lbs and 19,500lbs respectively on my current oil. Im coming up on 70k.

I am not really trying to be argumentative with you or anybody else if you want to run synthetic motor oil. We all have to do what makes us feel comfortable and happy.

But I know the Cummins engine will go over a million miles with Dino oil. It will in all likelihood outlast the Dodge truck body. As often as I change oil, I just don't see the need to spend all that money on synthetics to make my million mile engine go 1.1 million.

 

I agree with you as well!! My truck pulls all the time and right around the same weight you are pulling and sometimes more. I have over 270K and have had no prob with DINO oil either. Just change it and run good filters and you will be fine that is the key to a long lasting engine!

But like some say "If it you makes you feel better by using it, then put it in"