The1's Daily

[The1]

if you havn't read the history of mobil, have a read of these, quite interesting some of it.

http://en.wikipedia.org/wiki/Standard_Oil
http://en.wikipedia.org/wiki/ExxonMobil
http://en.wikipedia.org/wiki/Mobil

[vlad01]

Yeah I am not sure about the rating mention in the joe gibs, but I have seen few engine tear downs and UOA running various oil from Joe gibs and all have been very good that I have seen.

Also the whole mobil oil thing in the states is why a lot of Porsche and vw builders and owners are shying away from mobil as there is strong evidence of oil related wear and engine failure. And doesn't help the whole M96 and M97 engine failure situation Porsche currency have, those which are water cooled engines.

But there is nothing about the aussie mobil oil? I wasn't even aware it was different to the US.


The whole oil spec labeling thing is really annoying, every company has a different means of labeling which is bs if you ask me. They probably do it to sell their product and hide info about their formulations.

only real way to tell is do test on new oil samples before using them to determine which oil have what in them.

[The1]

yeh can't trust any companies these days, so UOA's and virgin tests it is.

I have done Virgin with my UOA's for comparison, though i didn't get one done with the 5/50, could only afford one, maybe later. Ill post results soon when i get the 5/50 UOA results back.

[vlad01]

I am thinking of trying these guys on my next oil change. I bet my oil will have a tone of iron and chromium

http://www.roktex.com.au/

gota love those balancer shaft bearings

[The1]

i use http://www.oiltest.com.au/

Report and graph gets emailed, let me know how you go with those and what the reports like. Not that they shouldn't differ should have all the same info available.

[The1]

Here's my results, tabled it and did it all together.

I see oxidation/nitration/sulphation is worst in the 5/50
0/40 has the worst wear for metals and is the only one to have barium.

To me it's between 5/50 and 15/50, more towards 15/50 because of the oxidation etc issues.

Thoughts?

oil results.jpg (153.58 KiB) Viewed 4707 times

[Holden202T]

well 15/40 or something like that is the recommended for that motor isn't it ?

[The1]

From memory the workshop manuals and car book says 20/50 for normal use and 10/40 for snow.

[DavoF]

I used to work in used oil analysis for a number of years doing all these tests. I just did the testing not the analysis so please correct me if i'm wrong, but I did learn a few things along the way.

From what I remember the wear metals are the first section from lead to titanium. The metals from magnesium to barium are from additive chemicals in the oil. Silicon and sodium can be from coolant but will usually be big numbers (>500ppm)if there is a leak, not sure about Vanadium.

TAN = total acid number, TBN= Total Base Number

With TBN: There is an additive called TBN additive witch counteracts the formation of acid in moisture in the oil (usually from short trip driving). The TBN test, tests how much of the additive is left. Usually the higher quality oils like Mobil 1 should have the highest amount of TBN additive.

If TBN gets low usually TAN increases.

From the TAN/TBN numbers there, to me it looks like they have the results mixed up. But maybe this lab measures them differently.??

With Viscosity tests an increase in viscosity can be from high oxidation or high soot. Lower viscosty from fuel in the oil or breakdown of viscosity modifiers due to shearing.

High nitration is usually high ignition temperatures forming increased Nitrogen oxides.
High oxidation is usually high ignition temperatures (burning oil basically)

I worked in the industry 5 or 6 years ago so I've forgotten some things but this is a rough idea of how it works.

One time we got a sample from a v8 supercar that blew an engine the week before. It had wear metals >1000ppm for iron, and high for most of the others. You could actually see the metal in the botom of the sample

Hope the info helps.

[The1]

Good Info there! Yes seems strange then with the TBN/TAN results from the info, from the rest of the results though 15/50 is the pick? Would seem it gives the best ring seal to with the blowby contaminate levels in the last section. Wow can't be doing any good with that much metal going around the engine in V8 SC