what oil to use

[tanque55]

Well after I posted this I did a search, should of done it before posting I know, but I am still a little confused. I was reading a post (actually a lecture on oil, oil 101, oil 102 ect....
Conclusion being that most engine wear occurs at start up and using the 0 and 5 -30 will protect the car as good as the higher 40s and 50s as most have the same protection at operating tempatures. The lower number supposedly flowing better at start up. I guess the old notion higher viscosity protects better is not always correct.

[JFP in PA]

Originally Posted by tanque55

Well after I posted this I did a search, should of done it before posting I know, but I am still a little confused. I was reading a post (actually a lecture on oil, oil 101, oil 102 ect....
Conclusion being that most engine wear occurs at start up and using the 0 and 5 -30 will protect the car as good as the higher 40s and 50s as most have the same protection at operating tempatures. The lower number supposedly flowing better at start up. I guess the old notion higher viscosity protects better is not always correct.

That is not necessarily correct as it totally leaves out several issues pertinent to start up (film strength, additive types, base polymer technology or oil “Group”, etc.). Realistically, the “W” or cold viscosity choice should factor in everything, including the ambient temperatures the car is going to see. That said, most OEM “recommended” W viscosities have more to do with their desired impact on CAFÉ mileage performance than protecting your engine. Hence, when just a few years ago the OEM’s would spec 10W-X oil for use in near arctic conditions, now they spec 0W-X oils for use in LA and Dallas, which obviously begs a question or two as to why they recommend such a thin oil.

On the higher temperature viscosity, the actual choice of weights is very germane as it directly impacts the level of protection the oil affords your engine under load conditions. Because these engines run much hotter than most owners know, XW-40 is the minimum level of viscosity you should be considering, with the “W” weight choice based upon the lowest temperatures the car is going to see. For all but the most extreme cold condition’s, a 5W-40 or 10W-40 oil would offer you the best trade off combinations. From there it would be the level of ZDDP, base polymer type, etc.

[Jake Raby]

Originally Posted by tanque55

Well after I posted this I did a search, should of done it before posting I know, but I am still a little confused. I was reading a post (actually a lecture on oil, oil 101, oil 102 ect....
Conclusion being that most engine wear occurs at start up and using the 0 and 5 -30 will protect the car as good as the higher 40s and 50s as most have the same protection at operating tempatures. The lower number supposedly flowing better at start up. I guess the old notion higher viscosity protects better is not always correct.

Modern engines have much tighter clearances than old engines. This changes the whole game.

I recently carried out a study on start up wear to support the development of our IMS Solution. The test engine was started and stopped 5,200 times in the crazy July heat that we recently had to endure. I have received the results of this study and will carry out the same study in the winter at LN Engineering in Illinois where it gets way colder than here in Georgia. The same oil, engine and car will be used for both studies.
The results of the 5,200 starts in the hot climate were amazing before and after.

I leave on a 6,000 mile R&D trip in that car tomorrow :-)

The oil used for the studies is our DT40, its all we use... Nothing else.

The results of the studies will be published in my M96 Engine Bible.

[JFP in PA]

Originally Posted by Jake Raby

Modern engines have much tighter clearances than old engines. This changes the whole game.

I recently carried out a study on start up wear to support the development of our IMS Solution. The test engine was started and stopped 5,200 times in the crazy July heat that we recently had to endure. I have received the results of this study and will carry out the same study in the winter at LN Engineering in Illinois where it gets way colder than here in Georgia. The same oil, engine and car will be used for both studies.
The results of the 5,200 starts in the hot climate were amazing before and after.

I leave on a 6,000 mile R&D trip in that car tomorrow :-)

The oil used for the studies is our DT40, its all we use... Nothing else.

The results of the studies will be published in my M96 Engine Bible.

Jake, I understand that you will be releasing an updated version of the DT40 oil soon; any word on when that will happen and what the differences are?

Thanks.

[Flavor 987S]

Originally Posted by JFP in PA

Jake, I understand that you will be releasing an updated version of the DT40 oil soon; any word on when that will happen and what the differences are?

Thanks.

I asked Jake about this a few weeks ago. Basically, he said the revised DT40 won't be ready till next year, and this planned revision is to address some of the start-up noise(s) associated with our boxer engines.