I use Amsoil 15w-40 in my 2004.5 just like I did in my '92 for most of its 218,000 miles before I sold it. Nothing was wrong with the '92 truck. I just plan on replacing my open race car trailer with an enclosed, I travel a lot, the extra power comes in handy in the hills up and down the eastern U.S. and the 4-door provides extra room. Gets better mileage to boot!

I did see an obvious decrease in operating temps while towing and a slight improvement in mileage in my '92 when I switched from conventional Rotella 15w.40. Less heat and better mileage means less friction/wear and more power. With 20,000 miles on my '04.5, I couldn't say how much fuel mileage increased at my first oil change because it keeps getting better, before and after! Still breaking in, I guess.

My engine builder originally recommended it for my race car (0w-30 Series 2000) and I have it in everything now, including trans. applications. I'm not a dealer but one helps me out with my racing activities. I wouldn't have asked for a deal if I wasn't sure it was great stuff! I can't afford to have any problems on the road or with the race car.

Dealers have a network where you can ask if there is one nearby.

Amsoil dealer and info.

 

I just switched last week to Mobil 1 T&S 5w40, and the weather turned to winter here over night...down to 12 degrees this morning and the Cummins had to sit out last night...NOT plugged in.

I was concerned about it starting but it fired right up without any hesitation....quite a lot of white smoke for about a minute and then stopped.....

I was glad I had switched from the regular Dino 15w40, though I don't know if it would have been much different.

It seems that the truck warms up a little quicker with the synthetic oil, but it might just be my imagination.....any thoughts on this??

 

RustyJC,

Thanks for your reply to my reply regarding why you chose to use conventional (Delo) oil in your Cummins, back on 11/30/'05.

I new, from previous experience, that you would have a good explanation. And, once again, you did. I always enjoy & learn from your posts.

Joe F.(Buffalo)

 

Unless your engines are completely broken in (30-50,000 miles) using synthetic oil in the crankcase is going to increase your oil consumption and delay ring seating. Don't buy oil just because it says "synthetic" on the label, these are an improved oil over standard base stocks but are not a chemically engineered and derived oil. The biggest reason we don't use Mobil 1 is they claim to do everything with 1 oil for every application where as the other series IV synthetics have job specific oils. Amsoil, Royal Purple, Redline and a couple others all have the very best PAO base stock in them and a group of very specific characteristics which make them better than non-synthetics. Higher heat break down temperatures, higher cold flow abilities and a molecular cleaner product, you own an engine worth $10,000+ and won't spend more on the hearts blood?????? Personal choice-yes logical-no, modern engine and technology filled with yesterday's products and upheld by out of date maintenance schedules. I find it interesting that even the guy's producing the synthetic base stocks like where I work (Syncrude) are using extended maintenance schedules and synthetics on $5 million trucks. Meanwhile people with vehicles worth 1/150 of that rely on oil companies and vehicle manufacturers who rely on parts and oil sales for nice fat profit margins. The argument then comes up the guy's you work for are also profit driven and that's true but we don't need to solicit for business we can't keep up to demand for our base stock. Personal choice, your money use what you want but invest some time in modern research and technology- the truth is out there. PK

 

Huh? Are you really saying that there's no difference between regular Mobil I (automotive) and Delvac I/Mobil I Truck & SUV? No difference in additive packages?

Rusty

 

I had an 89 stepside Chevy with a 350. I used Mobil-1 after about 45k. I "thought" that my timming chain was toast @ 220k so I changed it... it was only about 2 degrees out! I never had a problem out of that motor. I had no leaking gaskets, nor did the valve covers ever come off..."0" problems. That motor with Mobil-1 never let me down. I finally sold/traded that truck.......with 500,000 miles on it. Oh, and it did not smoke.


Oh yeah, if you think the motor had an easy life...guess again. 2 sets of custom front rotors, iced. Bought, built or replaced "9" transmissions, 5 OEM and 4 custom. Wore out the rear, rebuilt it, broke it, bought a new rear, busted that rear and overhauled it HD stlye. ....I've never heard of an engine that lasted like mine did. Heck, it'd still leave black marks from a dead stop @ 750 RPM.



.......Why do the folks at Porsche and Corvette send out their new cars with Mobil-1? In the manual Porsche even states break-in to be @ 30K with Mobil-1.

 

how about Schaeffers ??

 

OOOO!! I just found Royal Purple locally for $6.18/qt!!!

It's going in the Maxima in a few days, even though it's not due for an oil change (haha).

jh

 

How does $5.35 a qt. sound? That's what I paid by buying a 5 gallon pail from longrider.com. It was $85 for the 5 gal, but with shippping/haz etc. it ended up at $107 total delivered price to my door, which somes out to $5.35. Not too bad.

The guys at longrider.com were great to do business with, and one of the guys from Royal Purple had been replying to my emails I sent to RP with lots of good info, and as it turns out, he knows the Dodge/Cummins, because he has one.

 

Delo 5-40.

 

Delo comes in 5W40 synthetic?

 

Yup! (15-40 "regular" & 5-40 syn.)

 

I've known the guys from Longrider and Royal Purple for over 10 years. While they are great guys, unless things have changed recently, thier diesel motor oils are not full synthetic base. Read the literature carefully and request MSDS sheets. Last I looked they say synthetic and mineral oil base stock with synthetic additives. Thier literature claims synthectic additives but nowhere does it say full synthetic. I'm not saying it's bad oil, but thier advertising is a little misleading. The performace gains they site were in big fleet trucks that were on the road constantly. Most of thier data is old ( reference the $1.07 per gallon diesel price) the OSU tests were done back in the mid 90's.
The performance gains were real, it was not compared to modern synthetics, or even older synthetics. Most of thier tests were comparisons made against a standard mineral based diesel oils. The increase in hp and torque were due to the additive package they use and today, even that isn't as good as it was 10 years ago. That's why I stopped using R.P. 1 more thing keep an eye on your fuel mileage, when thier additives quit, your fuel mileage goes down. Very quickly, from one tank to the next it will drop 20%.

 

Help me out here, I was just on their website for the first time today. Is the oil from Longrider ths SAME oil as the Royal Purple that you can buy at NAPA, Jegs, etc? Those oils are full group IV. Oil like Rotella Synthetic, and Castrol Syntec are group III. If the additive package drops off that quickly, you're talking ~3 mpg. Are you saying a like truck with dino would get say 17 mpg and the RP 20 mpg as long as the additive package was intact and 17 when it quit???

 

A few years ago all the R.P. oils were full synthetics. Then they changed the additive package and decided to offset the expense by using a mineral/synthetic blend for the base oil. The Longrider came out during that time. It is a joint venture between R.P. and the guys at Longrider. Based on the advertisements that I've seen, my guess is the Longrider is still not a full synthetic. Nowhere does it say that it is, and I'm sure if it were, they would let it be known.
The secret to all the R.P. products is the Synerlec additive. The only full synthetic motors oil that R.P. sells are the racing oils, which sell for $8/qt and will not support any factory warranty.
My caution about the sudden drop in fuel mileage is just so you know when to change the oil. You can't base oil changes strictly on miles driven.
I prefer to run good synthetics that are easier to buy, just in case. Like I said, I've not seen any testing by R.P. done against any modern synthetics, to prove they are a better oil.
BTW, there is a difference in additive packages between Mobil1 Delvac and the Mobil1 SUV/Truck synthetics. The Delvac is considered a heavy duty diesel oil, and meets all manufactures' oil requirements. It has more oxyidation inhibitors and a higher load rating.