Bob, I use Mobil 1 5W-30.

Ken, I had copied this info, along withg info from Dr. Haas, and some other info, and use all this info to try to make an intelligent choice. Anything you read on the net you have to take with a grain of salt. You have to use your own common sense as to what may be right and what may be wrong. Although this GM engineer doesn't see the need for synthetics for most applications, I still use and believe in them, as you may not be able to measure what is going on at the bearing - journal, metal-metal interface, and synthetic I believe gives me that extra protection in my grocery getters along with my cobra engine. I still use synthetic, but use conventional during break-in.


This GM engineer has some good info. He really slams amsoil though, not that it isn't a good product, but only some of their claims.

When I had posted the info from Dr. Haas, I had asked at the end if anybody wanted me to post additional info, I was mainly referring to the above info that I had posted here.

Anthony, glad you posted the latest info, both were good and interesting reading. I must admit, did go into Dr. Haas' seminar with some skepticism, due to his credentials...but I'd bet there are MANY folks here on CC who are scholars (and even more who are students) on subjects near and dear to their hearts, and whose opinions should be valued even though they (like Haas) don't have formal training in their area of study and interest.
I liked what Haas had to say about the viscosity advantage of synthetics, which the GM guy didn't address...subtle but important topic differences.
So, now I guess I'll use the thinnest dinosaur oil I can find that gives me acceptable pressure?
Thanks again for posting...

I was told a while back by my last engine builder (the one after all the problems), that I should use Kendall GT1 because of it's zinc content.

See the chart around half way down the page here: http://www.micapeak.com/info/oiled.html

A lot of good reading info..............I have used conventional oils all my life and have very good luck with them,last company car had 250,000 miles,present company car has 285,000 miles, neither engine has had more than regular (4000 miles) oil changes and tuneups............

Talked to a Shell Engineer about some of the same stuff here, he also recommends conventional oil based soley of price, he also states synthetic and conventional oils should be changed at the same interval and most autos can go 15,000 miles between oil changes...............He showed me a study Shell did a few years ago with their diesel oil Rotella T.......they took a brand new 18 wheeler with a Cat engine for a cross-country trucking firm and filled it with Rottela T and sent him on his way, all they did was change the oil filter at the manufacvters recomendations and add the needed amount of oil lost with the filter change, they wanted to see how long the engine would last under these conditions, THEY QUIT/GAVE UP THE TEST AT 1,000,000, THAT'S ONE MILLION MILES, the darn thing was still going strong.....................go figure...........I know diesels are different from gas enignes, but sometimes these things make you wonder...........

Well, I'll keep my oil changes to 4,000 miles on my personal cars and every other race on the race car..........cheap insurance to me...............

David

To all:

There are a number of factors that will ultimately determine the life of the oil used and its ability to protect your engine, & Powertrain. The base oil (synthetic or mineral) is the most criticle factor....and the the addatives or packages (polymers used to stabilize acidity and oxidation) included in the finished product...Oh! and don't forget the filter...

1. Why add oil "boosters" to assist in what normally takes place in any oil...(STP,Prolong, slick 50, and the likes.....) especially in a mineral based oil which begin to loose viscosity after 600 or so miles......I tested 12 brands myself and included 4 popular synthetics as well.... and they all are different..

Reason denotes " If a tables legs are weak(meaning baseoil) why add more weight on top of the table...." I say invest in a much stronger table"..... Right! In this case a 100% synthetic oil Brand (AMSOIL).

2 . The Type 4 and type 5 synthetic oils are Organic and 100% synthetic... however there are performance differences between them to dictate their practicle applications...especially in the automotive industry.
Type 4 lubes "polyalphaolephins" are the most robust (Stablity and longest service life 36,00 miles of more or up to 3 yrs) over their type 5 lube counterparts "Di-Esters" (short stabiltiy 60-90 days, and high stress) are commonly recommended in Off Road Racing. Never put a race-oil in a street car for which the internal oil pump was never specified or designed to handle...

3. There are very few only 2 lubricant manufactures who's specs meet and US DOD and Mil specs for extended and severe service; especially in their New M1 Abrams tank and X18 & Yf22 Jet aircafts (Mobil and AMSOIL)

4. Because the filter is the only device for cleaning the oil and removing sediments which flow in the oil You would need the most efficient filter to compliment your lubrication system. When the typical OEM and Aftermarket filter contain a paper element, (Ford Motorcraft, Fram, many others) and is only efficient up to 76% for again 600 or so ...miles yes your oil would become black and evenually loose itsability to properly lubricate the parts with .002-.005' tolerances......Get the most efficientfilter out there available to protect and keep the oil as clean and as long as possible.... even up to 25K miles...They do exist and I have seen a few filtering systems designed specifically for extended use... A 98.7% efficient @ 15microns Full Flow Filter which even surpasses Mill specs....AMSOIL AAo(New Product line).

5. There can only be One! and its AMSOIL, since 1972 World Leader in Synthetics and holder of the Most Lubricants Patents (API and SAE) and this new Filter Technology standard...

Remember "A chain is as strong as its weakest link"

Why Would you use any products or put anything less than the best in your Vehicle or equipment....?

Hope this response was helpful.......

Stick with the Best Synthetics,AMSOIL ....
 

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