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Old 05-31-2007, 10:50 AM   #1
bluesubie
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Join Date: Jan 2000
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Location: N.J.
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04 FXT

Thumbs up Motul 8100 5W30 Used Oil Analysis - 5900 mi.- FXT

I switched from German Castrol (GC) to Motul 8100 5W30 for winter to see if it would help with fuel dilution due to my short daily trips since it is a thin 30 weight oil (9.9 cst's at 100C). It did.

I thought that it might shear to a 20 weight since it's so thin, but it stayed in grade and still has plenty of life left. Look at the viscosity at 210F and you can see that this is thinner than GC. UOA by Blackstone and oil was in use December 23rd to March 6th. The oil is still in and I'm not sure what I'll be running when I change it.

Code:
Current; gold GC @ 7,000; gold GC @ 7,478; gold GC @ 6,144; green GC 
@ 5,930; M1 5W30 @ 5,774.

Equipment make: Subaru
Equipment model: 2.5L Turbo
Oil use interval: 5,900
Oil type & Grade: Motul 8100 Eco-nergy 5W30
Make-up oil added: .25 qts.
Miles on unit: 51,650
Air filter: OEM
Oil filter: OEM

Dennis: Sodium dropped again, and wear looks terrific. 
The TBN read 4.8, still plenty of active additive left in the oil. We’re glad 
to see that you haven’t changed this oil yet. It still has plenty of life left 
in it. No fuel or antifreeze found. Add another 2,000 or 3,000 and check 
back. If wear still reads low, you may not even need to change it at 
that point.

Aluminum 4 5 4 4 4 6 
Chromium 1 1 1 1 1 1
Iron 11 12 16 11 10 15 
Copper 6 8 7 10 6 20 
Lead 2 3 3 3 2 2
Tin 0 1 0 1 0 0
Molybdenum 3 2 9 4 12 63 
Nickel 0 0 0 0 1 0 
Maganese  0 1 0 0 0 0 
Silver 0 0 0 0 0 0 
Titanium 0 0 0 0 0 0 
Potassium 0 2 0 0 0 3 
Boron 1 0 0 1 14 115 
Silicon 14 13 15 15 18 
Sodium 11 19 18 6 2 6
Calcium 1252 1783 2165 1689 2582 3394 
Magnesium 953 530 436 398 106 10
Phosphorous 932 796 816 754 680 764 
Zinc 1025 974 1011 909 818 904
Barium 0 0 0 0 0 1 

Properties
SUS Viscosity @ 210F: 58 66.2 66.4 64.4 64.8 57.8  [56-63]
Flashpoint: 370 380 380 385 365 395 [>365]
Fuel %: .5 TR 2.3 .5 1.0 .5 [<2.0]
Antifreeze: 0 0 ? 0 0 0 [0]
Water: 0 0 0 0 0 0[<0.1]
Insolubules: .3 .4 .2 .5 .4 .5 [<.6]
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Old 06-01-2007, 02:08 AM   #2
alanlcit
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Dennis,
Just a question, since I don't know the answer and am curious about how this works: How does running a thinner oil help with fuel dilution?

Thanks,

Alan
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Old 06-01-2007, 10:27 AM   #3
bluesubie
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I believe that since the oil is thinner the engine gets up to operating temp. more quickly and is able to burn off more fuel in a short distance. German Castrol is thicker than most 30 weights in freezing temps even though it is a 0W30, which might be the reason for the high fuel dilution in the past.

Of course there are varying views on this and some people told me that a thinner oil would not help. We didn't get really cold in NJ until late January, so that could have been a factor.

The runs that showed fuel dilution higher than .5% were all during winter on GC.

-Dennis

Last edited by bluesubie; 06-01-2007 at 10:33 AM.
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Old 06-02-2007, 03:19 PM   #4
esteve
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Very nice report, the Motul looks to be great stuff. It's nice to see a thin 30 weight that doesn't shear out of grade for a change.

So are you going to stick with Motul, maybe something thicker for non-winter use? I've seen the stuff at the local Autobacs but I've never checked the price, must cost a pretty penny huh?

And what's up with NJ air all the time!? Maybe the humans need air filters too!
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Old 06-02-2007, 04:42 PM   #5
bluesubie
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I'll probably keep the Motul in for a few more weeks and then go back to GC for summer. Although it's 90 today so it already feels like summer!

It was only $6.99 a quart from Mastro, but of course you have to pay for shipping. That's the cheapest that I've seen it on-line. I got my current GC on sale for $4.50 a quart.

I'm baffled by the Silicon. I've only done two UOA's on my wife's '99 OB and it was less than 10ppm's both times with a K&N panel filter. Maybe it's because she drives to cleaner western NJ for work, and we take my car if we go to NYC or up and down the NJ Turnpike (I95). I'll probably do a Dyson at the end of my next GC run to see what he says about the Si. I've even had my dealer make sure that my intake box isn't leaking.

-Dennis
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Old 06-03-2007, 04:51 AM   #6
FD777
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Nice report

As you already mentioned, maybe the winters caused the fuel dilution.
Winter -> Cold Weather -> Takes longer to reach operating temp
I believe that if your oil doesn't get "hot", the fuel stays in the oil instead of being "burnt" off. (Unfortunately, I don't really know the chemistry between fuel and oil... so I can't really back this up!)
This is why short trips, excessive idling and cold weather can cause fuel dilution.

As for why thinner oils help fuel dilution, I never found a concrete answer. Do thinner oils heat up faster? I also remember reading a bitog thread that thicker oils tolerate fuel dilution better than thinner oils. And viscosity doesn't affect an oil's affinity (or lack of) towards fuel. (IIRC, from Molakule).

Too many questions, so little knowledge.
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Old 06-03-2007, 02:05 PM   #7
bluesubie
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When I get around to it, I'll post a UOA on my daughter's 2000 RS. Fuel was at 2% due to 1 mile trips to high school and daily short trips around town. The oil, Havoline 5W30, sheared to 54.9 SUS (a 20 weight) in 3,600 miles.

Even with 2% fuel dilution on GC, it remained a very thick 30 weight so thicker oils do tolerate fuel dilution better. Plus GC has elves in it.

-Dennis
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Old 06-21-2007, 01:27 PM   #8
drees
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Nice report. What's your driving style like?
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Old 06-21-2007, 01:49 PM   #9
bluesubie
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I drive 5 miles each way to mass transit. I usually leave my house just in time so my warm-up is about 10 seconds (unless I'm scraping snow/ice in the winter). Easy driving until the engine is warm.The last five minutes is 50-60 mph with some lights and I usually hit 5 or 6k rpm's. At least once a week I drive to some twisties for fun (low speed, high rpm's).

Summer is trips to the beach, vacations to SC, light off-roading and general "enthusiastic" driving. No track or auto-x, except for the NJ Turnpike. Engine all stock. Enough details?

I'm thinking of sending this to Dyson to see what he says about the Fe and Si. I'll probably go with GC again (because of price) but Elf Excellium 0W30 has me curious. It's ACEA A3 rated and an n/a OB owner on bitog is getting 33 mpg's with it. Expensive though.

-Dennis
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Old 06-21-2007, 03:37 PM   #10
drees
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Your winter commute sounds fairly harsh, I would expect that your oil temps just barely get close to "normal" by the time you get to the last 5 minutes, so no wonder you have fuel dilution in the winter.

I've got to imagine that the Fe is a byproduct of those short trips since the engine probably collects a decent amount of water through condensation.

Si is definitely elevated, you using the stock air filter?
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Old 06-21-2007, 03:51 PM   #11
bluesubie
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I was thinking that the iron was from the short trips as well (after some reading at bitog).

My first couple of uoa's were with an Amsoil foam filter and everything after that was OEM to try to bring down the si. My wife's OB has a K&N panel filter and Si was in the single digits on the two uoa's that I did on that car.

-Dennis
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