Used Oil Analysis

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Used Oil Analysis

Postby ccb056 » Fri 13.07.2012, 22:50

Haven't seen any of these posted on LEC before, decided to run one after the first oil change since owning the car.

The additional 2 qts of oil was due to the replacement of the timing belt and assorted seals midway through the oil change interval.
It would be interesting to know how good these are at predicting HGF, which seems to plague our cars, by looking at the 'Antifreeze %' at the bottom.

We put Castrol Syntec 10w30 in the car a day after purchase, not sure of the history of the original owner or oil use.
Since then I was able to find the Lotus Service Bulletins and see that Mobil 1 0w40 is approved for the car, we are now running the Mobil 1.

Image

Thread Cross References
BITOG Run 2
BITOG Run 1
Last edited by ccb056 on Wed 07.11.2012, 02:22, edited 1 time in total.
1991 Lotus Elan Fed, Monaco White
Mobil 1 5w50, PureONE PSL14459, Redline MT-90
Piper 2.5 Resonator PCE; 21mm wastegate; Everest
Quaife ATB LSD, BCN Cables and Short Shift, Bridgestone Potenza RE-71R
ccb056
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Location: Michigan, USA

Re: Used Oil Analysis

Postby chris.t » Sat 14.07.2012, 07:59

I've done this with my vx220 which has been quite extensively modified. To make any sense of it though it obviously has to be done regularly to recognise trends.
Could the 'Hokey-Cokey' actually be what it's all about?
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Re: Used Oil Analysis

Postby rip » Sat 14.07.2012, 10:12

It would be interesting to see comparisons between different oils too.
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Re: Used Oil Analysis

Postby ccb056 » Sat 14.07.2012, 12:55

With everyone seemingly using a different oil in the Elan I'd be interested in some quantitative data like this for comparison. 10w60, 0w40, and 10w30 comes to mind
1991 Lotus Elan Fed, Monaco White
Mobil 1 5w50, PureONE PSL14459, Redline MT-90
Piper 2.5 Resonator PCE; 21mm wastegate; Everest
Quaife ATB LSD, BCN Cables and Short Shift, Bridgestone Potenza RE-71R
ccb056
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Posts: 232
Joined: Mon 13.10.2003, 22:27
Location: Michigan, USA

Re: Used Oil Analysis

Postby ccb056 » Tue 06.11.2012, 23:34

Here's the new analysis of the Mobil 1 0w40

Image

1. The mileage was almost the same for the two oil runs (4660 and 4710 mi). The owners manual says to replace at 6000 mi.
2. The first run used Castrol Syntec 10W30. The second used Mobil 1 0w40. The car now has Mobil 1 0w40.
3. The first run used a WIX 51334 filter with a Beta ratio of 95% at 20 microns. The second used a K&N HP-1004 filter with a Beta ratio of 93% at 20 microns. The car now has a PureONE PL14459 filter with a Beta ratio of 99.9% at 20 microns.
4. The first run consisted of a lot of highway driving. The second had more city driving, short trips, and an autocross.

The largest issue in this report is the fuel, up to 2.0% from 0.8% The cause of this is likely due to driving style, short trips and idling. The car did a short trip from cold immediately before the oil change.
When the car was purchased 10,000 miles ago a dry compression test was done: 140, 135, 130, 140 psi on cylinders 1-4.

Mobil 1 0w40 starts off with a viscosity of 13.5 cSt at 100 degC, and because of the fuel and shearing effects it thinned to 10.56 cSt. If the fuel had stayed out of the oil the viscosity would have been higher, resulting in better engine protection. However, the Mobil 1 even with the fuel dilution was thicker than the Castrol 10w30 at the end of the run.

Mobil 1 0w40 starts off with a flashpoint of 446 degf, the fuel dilution reduced this to 335 degf.

TBN was robust, showing a lot of un-reacted additives still remaining in the Mobil 1, however because of the lowering of the viscosity due to the fuel I think it was time to replace the oil.

Comparing formulations between the Castrol Syntec and the Mobil 1 we see that:
Syntec has a little more molybdenum, an anti-wear additive
Mobil 1 has 3x more boron, a corrosion inhibiter, anti-wear and anti-oxidant additive
Mobil 1 has 1.5x more calcium, a detergent and dispersant additive
Syntec has 4.5x more magnesium, a detergent and dispersant additive
Mobil 1 has a little more phosporus and zinc, anti-wear, anti-oxidant additives

Thread Cross References
BITOG Run 2
BITOG Run 1
1991 Lotus Elan Fed, Monaco White
Mobil 1 5w50, PureONE PSL14459, Redline MT-90
Piper 2.5 Resonator PCE; 21mm wastegate; Everest
Quaife ATB LSD, BCN Cables and Short Shift, Bridgestone Potenza RE-71R
ccb056
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Posts: 232
Joined: Mon 13.10.2003, 22:27
Location: Michigan, USA

Re: Used Oil Analysis

Postby ccb056 » Mon 07.10.2013, 07:57

UOA_130805.png


Above is another run on the Mobil 1 0w40. Ran with the Purolator PL14459 (Beta ratio of 99.9% at 20 microns, 13 gram capacity).
A bit more miles on here than before, 5310 in total.

At the beginning of this oil sample the everest chip was installed and the pcv valve was replaced (the original was plugged).
Replacing the PCV valve seems to have fixed the fuel in oil issue (both viscosity and flash point are up).
The extra boost from the everest chip doesn't seem to be causing any additional wear (Al/Fe/Cu/Pb all constant).
Insolubles are decreasing slowly, the engine is getting cleaner.

There were numerous autocrosses, highway driving to LOG 33, and city driving on this sample.

Mobil 1 0w40 with a Purolator PSL14459 was put in (Beta ratio of 99% at 25 microns, 27 gram capacity) allowing for theoretically less restriction to flow.
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1991 Lotus Elan Fed, Monaco White
Mobil 1 5w50, PureONE PSL14459, Redline MT-90
Piper 2.5 Resonator PCE; 21mm wastegate; Everest
Quaife ATB LSD, BCN Cables and Short Shift, Bridgestone Potenza RE-71R
ccb056
Enthusiast
 
Posts: 232
Joined: Mon 13.10.2003, 22:27
Location: Michigan, USA


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