Wow...I am going to have a hard time waiting all of 6000 miles to change my own synthetic oil; I've been doing 3-4k mile changes for 38 years now and it's a hard habit to break. No way would I leave any oil in any engine for over 10,000 miles....Amsoil might be good stuff, but can't make contaminants disappear.

As for punctuation--it's not English class but if you actually make your posts readable, they will be more readable....and sorry, but I *was* an English major back when we wrote essays carved in stone tablets with chisels

I really mean no offense, but this is one "sentence" from your original post--one period at the end--do you find it to read clearly?:

"we have a 01 f150 with the 5.4 with 146000 miles on it and two jeep grand cherokees both over 100000 miles on it and my truck is a 04 f150 with the 5.4 its my first oil change and it has 59000 miles on it i have no complaints about using it except its really pricey 2 filters for the trucks and 1 for the jeep and 2 cases of oil was 265.00 it says 35000 mile intervials but i know the other oil we used was 25000 and we never changed it earlier either."

Now if you're typing this on a blackberry with one thumb while you're driving, I'll forgive the periods and capital letters, but then will give you a hard time about driving with distractions....

 

The thing that got me hooked on mobil 1 synthetic is all Coast Guard aircraft, both fixed wing and rotor heads use it religiously.

Tim

 

Whats all the fuss about. Use whatever you want to. Change it when you want to.

 

Too true!haha

 

go on the amsoil website and you can read independent test results comparing oils etc.I like changing my oil once a year on a nice warm spring day.I've used Amsoil for several years and and feel confident.also check out preferred customer program,could save if you buy enough.I also use there air and oil filters.there air filters are tested to flow as good as a k&n with better filtration than celluose.

 

For what it's worth, close friend works for one of the top Indy Car teams, they always run a semi-synthetic, not full synthetic.

 

Lets see, it's this way Amsoil is nothing but a major marketing effort, they are nothing but a MLM oraganization.
Any claims on Amsoil is usually a site from AMSOIL or one of it's pyramid distributors!
Actually AMSOiL was made for the automotive population based on API requirements,based on synthetics already being used in aircraft.
I am not a proponent of AMSOIL since they still refuse to this day to pay for ACEA and TCW3 certification! All I hear is they guarantee their oil, that it meets or exceeds all certifications and didn't see the need to pay the small amount of $$ to get these certifications. Well go try and prove the oil was the reason for failure. Good luck on that! So the guarantee is weak! I only use certified ACEA oils in my cars that require it and TCW3 oil in my outboards that require it!

Now as far as using synthetic in your 50K mile truck, WHY?
Unless you extend your oil changes beyond the factory recommendation it's a waste of money!

Motorcraft 5w-20 is a synth blend, and works extremely well. Going to full synthetic is just thining your wallet.

As far as Pennzoil leaving a brown residue or whatever was described, you can't blame the oil since you have no information on if the drain intervals were adhered to! To many variables to just blame the oil. I don't buy it! Maybe a good analysis of the oil prior to making assumptions would have really told the truth!

 

Synthetic oil used to mean PAO or Ester based synthetic lubricant. Begining around 1984, improvements in base oil technology has allowed so called "dino oils" to meet the same specifications previously only attained by traditional synthetics. Called "hydrotreated oils" they are so effective and so much more economical that this is what is offered to us as synthetic oils from most oil manufacturers like Mobil or Pennzoil. I will mention Amsoil separately, because they are a marketer, not an manufacturer. But include them as well.

The beauty of this technology is that our so called "conventional" or "dino" oils are no longer that. They are manufactured by the same process as the hydrotreated oils that get to be labled "synthetic." The only difference is the Viscosity Index and pour point.

But the difference is generally minimal. You pay a premium price for synthetic grade. But the difference is like the difference between regular and premium gasoline. In other words if your vehicle is designed to run on regular gasoline, you won't gain any performance and it's a waste of resource to pay for premium.

For many, it's a feel good thing. "My truck is an investment, so I will spare no expense with oil or change intervals!" Well for one thing a vehicle is not an investment, it's a cost. No one is going to make an investment that depreciates value over time. Oil is a consumable commodity, just like fuel. I have yet to see anyone purposely seek out and purchase the most expensive fuel on the basis of "spare no expense, nothing is too good for my truck!"