Dear BITOG members,
Some time ago I posted the following oil analysis: Motul 300V 5W30 11500km/6months
https://bobistheoilguy.com/forums/t...-11-500km-audi-s5-4-2-v8.331145/#post-5519122
The results showed good wear protection however a critically low flashpoint. In the topic we have debated to what the cause could be. The silicon levels were a bit up which I suspected the air filter might be due for change.
I had my spark-plugs changed and the air filter. I speculated that perhaps the combustion was not optimal leaving fuel behind. This in turn caused the fuel contamination that led to the sharp decrease of the flashpoint. Changing the air filter should also put the silicon levels down. Also the oil was replaced with again, 300V 5W30.
After driving for 4500km over a period of 8 months I did another analysis. Which is the this (attached) one. The (most relevant) results:
Wear;
All kg
Additives;
Moly: 620
Properties;
Visc @ 100c: 11.59
Flashpoint: 160-190c
BN: 7.4
TAN: 1.97
Others;
Silicon: 105
Again it looks like lubrication and prevention of wear is spot on. Viscosity is great and so is the BN and TAN. However, again, the flashpoint has lowered quite a lot in a short running interval. From 232c factory spec to 160-190c. Also the silicon content is higher than expected at 105. Considering the air filter was new, it is strange it has gone from 60 to 105.
Comparison of 1st and 2nd analysis:
1st (11,5k @ 6mth) --------------------------------------------------- 2nd (4,5k @ 8 mth)
Wear:
All kg ------------------- All kg
Additives;
Moly: 540 --------------------------------------------------- ---------- Moly: 620
Properties;
Visc @ 100c: 11,34 --------------------------------------------------- Visc @ 100c: 11.59
Flashpoint: BN: 6.8 ----------------------------------------------------------------- BN: 7.4
TAN: 3.58 --------------------------------------------------- ---------- TAN: 1.97
After the first analysis I contacted Motul Germany by mail and phone but got no reply, which was disappointing. After the second analysis I contacted a Dutch representative, Eric who was very helpful and we discussed both reports. We drew the conclusion that the 300V was not suitable (enough) for street driving, at least not for my car. Our idea was that the 300V oil is designed with high oil temperatures in mind and not resistant enough against 'low intensity road driving'. I.e. 'commuting'. After all, I am not racing all of the time on the freeway. Because, let's say 60% of the time the car is running at 25% WOT the combustion is not at its very best and fuel residue might dilute the oil too much. As opposed to racing ,where a car runs 95% at 100% WOT, the combustion and temps are higher, there is less chance for fuel residue to stay behind. On top of that, I drew the conclusion that the silicon levels might have to do with gaskets being dissolved by the additives in the 300V. For a racing car, no problem but for a road car that needs to do 300.000km over a period of 20 years, that is a problem.
Conclusion: 300V is not the most optimal oil for spirited street driving. It is good enough to get your car on and off the racetrack from home.
However, Eric told me a new formulation of 300V has been launched with a more street-spec formula. They are awaiting the results of tests in the real world to backup their expectations.
So now what? I still want the best protection! Together with Eric we decided to test the Motul 8100 X-clean+ C3 5W30 which also has the VW/Audi 504/507 specification for my car. The car has done 14.100 km over a period of 6 months with the Motul 8100 Xclean and the lab results are in which I have posted here: https://bobistheoilguy.com/forums/t...14-100km-6mth-audi-s5-4-2-v8-thread-3.347739/
Some time ago I posted the following oil analysis: Motul 300V 5W30 11500km/6months
https://bobistheoilguy.com/forums/t...-11-500km-audi-s5-4-2-v8.331145/#post-5519122
The results showed good wear protection however a critically low flashpoint. In the topic we have debated to what the cause could be. The silicon levels were a bit up which I suspected the air filter might be due for change.
I had my spark-plugs changed and the air filter. I speculated that perhaps the combustion was not optimal leaving fuel behind. This in turn caused the fuel contamination that led to the sharp decrease of the flashpoint. Changing the air filter should also put the silicon levels down. Also the oil was replaced with again, 300V 5W30.
After driving for 4500km over a period of 8 months I did another analysis. Which is the this (attached) one. The (most relevant) results:
Wear;
All kg
Additives;
Moly: 620
Properties;
Visc @ 100c: 11.59
Flashpoint: 160-190c
BN: 7.4
TAN: 1.97
Others;
Silicon: 105
Again it looks like lubrication and prevention of wear is spot on. Viscosity is great and so is the BN and TAN. However, again, the flashpoint has lowered quite a lot in a short running interval. From 232c factory spec to 160-190c. Also the silicon content is higher than expected at 105. Considering the air filter was new, it is strange it has gone from 60 to 105.
Comparison of 1st and 2nd analysis:
1st (11,5k @ 6mth) --------------------------------------------------- 2nd (4,5k @ 8 mth)
Wear:
All kg ------------------- All kg
Additives;
Moly: 540 --------------------------------------------------- ---------- Moly: 620
Properties;
Visc @ 100c: 11,34 --------------------------------------------------- Visc @ 100c: 11.59
Flashpoint: BN: 6.8 ----------------------------------------------------------------- BN: 7.4
TAN: 3.58 --------------------------------------------------- ---------- TAN: 1.97
After the first analysis I contacted Motul Germany by mail and phone but got no reply, which was disappointing. After the second analysis I contacted a Dutch representative, Eric who was very helpful and we discussed both reports. We drew the conclusion that the 300V was not suitable (enough) for street driving, at least not for my car. Our idea was that the 300V oil is designed with high oil temperatures in mind and not resistant enough against 'low intensity road driving'. I.e. 'commuting'. After all, I am not racing all of the time on the freeway. Because, let's say 60% of the time the car is running at 25% WOT the combustion is not at its very best and fuel residue might dilute the oil too much. As opposed to racing ,where a car runs 95% at 100% WOT, the combustion and temps are higher, there is less chance for fuel residue to stay behind. On top of that, I drew the conclusion that the silicon levels might have to do with gaskets being dissolved by the additives in the 300V. For a racing car, no problem but for a road car that needs to do 300.000km over a period of 20 years, that is a problem.
Conclusion: 300V is not the most optimal oil for spirited street driving. It is good enough to get your car on and off the racetrack from home.
However, Eric told me a new formulation of 300V has been launched with a more street-spec formula. They are awaiting the results of tests in the real world to backup their expectations.
So now what? I still want the best protection! Together with Eric we decided to test the Motul 8100 X-clean+ C3 5W30 which also has the VW/Audi 504/507 specification for my car. The car has done 14.100 km over a period of 6 months with the Motul 8100 Xclean and the lab results are in which I have posted here: https://bobistheoilguy.com/forums/t...14-100km-6mth-audi-s5-4-2-v8-thread-3.347739/
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