Has anyone done a UOA on the factory engine oil fill yet? If so, please post it here. I know there has been some discussion on this topic before, but no definitive answer yet. I stumbled accross this UOA of Subaru factory fill oil and thought it looked considerably different than any other conventional 10W30 oil UOA that I've seen. It appears to be a lighter oil with gobbs of moly, even more than Valvoline Maxlife. Have a look for yourself. Maybe Honda uses a similar break in oil in the S2K.

http://theoildrop.server101.com/cgi/ultima...ic;f=3;t=003573

 

I am in the process of collecting the data, so have refrained from posting anything just yet. We already have anaylysis on a typical oil change (non factory fill) and I've just recently received one from an S2000 engine rebuild at the dealer. The main discernable difference between the 2 is the high moly content. By chance, this also bears a striking resemblance to the factory fill analysis but the actually scan is not available and was based purely upon the memory of "WisconsinS2k".
The bottom line is that moly in an ordinary oil change is in the neighborhood of 75. In the rebuild, it's around 140. This is also what was in the factory fill.
I've always been of the contention that the moly present in factory fill was put there via the assembly lube and within minutes after the first start, this lube gets mixed into and diluted into the oil fill, giving the numbers we see. Moly was NOT put there on purpose to bring the concentration up in the oil. It just happened to be there for some other purpose.
The moly figure given for that Subaru oil is extremely high, but that may only mean that Subaru uses much more assembly lube than does Honda.
It is my opinion that there is NO special "magic" factory fill oil. As soon as I can get an analysis on the factory fill oil from new S2000, my final proof will be available. I may find by then, I may have to eat my words, but for now, I'm keeping to this belief.

 

Getting a new car?

 

Not another S anyway. But I do have a call out to anyone with a new S to let me do their first oil change so I can get a sample. I've also got a friend who's a tech at a Honda dealer north of here to try and get a sample for me as well.
It's just too bad that Wisconsin can't find his copy of the analysis for the factory fill.

 

I've drained plenty of them, but never bothered to save any. Used oil isn't worth much in the shop

 

But it might be worth saving just to see me eat crow.

 

Next one I get I'll save you some.

 

Too complicated to send it to me, unless, of course you can get your boss to foot the bill to send it to Blackstone.

 

You've never met my boss

 

Based upon this quote out of the UK service bulletin covering replacement banjo bolts, I would guess that the moly additive is part of the factory fill.

"Note 1 : During the assembly in the factory, new engines are filled with engine oil plus an additive called molybdenum. This additive facilitates the running in of the engine and its components. If the engine being repaired has covered less than 6,000 miles, add a can of molybdenum additive.
Adding molybdenum to an engine with more than 6,000 miles has no positive effect and therefore is not needed."