Oil sample results
11-04-2008, 01:57 PM
#1
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Oil sample results
<center><img src="http://pictureposter.audiworld.com/147904/rs4_shell_helixultra_5_40.jpg"></center><p>There was a guy on here that had a database
for RS4 oil samples. Maybe others would be interested in the results.
The oil is Shell Helix Ultra 5W/40
The fuel dilution or lack of it is very good
and the TBN is solid.
for RS4 oil samples. Maybe others would be interested in the results.
The oil is Shell Helix Ultra 5W/40
The fuel dilution or lack of it is very good
and the TBN is solid.
11-06-2008, 07:36 AM
#6
Engine is fuel diluting ... but Blackstone does not measure it correctly
Blackstone does not measure fuel dilution directly. It measures oil Flashpoint and then computes dilution. Unfortunately, it uses a method for measuring flashpoint that is almost always highly inaccurate.
There are several indications of severe fuel dilution in this analysis.
1) Shell Helix 5W40 has a starting viscosity of 14.5 cSt @ 100C. Your viscosity has dropped to 11.38, making the oil a 30 weight. This drop in viscosity is due to fuel dilution.
2) Manganese reads at 5 ppm. MMT is still used in fuel. When it shows up in oil analysis in the RS4 this is due to fuel dilution.
Aluminum and Silicon are from the cylinder walls, which are high strength Alusil, a high silicon aluminum alloy. These numbers will reduces as the engine breaks in fully.
Copper comes from the bearings in the engine. This should drop over the next 5K miles. If it does not, it indicates a problem.
There are several indications of severe fuel dilution in this analysis.
1) Shell Helix 5W40 has a starting viscosity of 14.5 cSt @ 100C. Your viscosity has dropped to 11.38, making the oil a 30 weight. This drop in viscosity is due to fuel dilution.
2) Manganese reads at 5 ppm. MMT is still used in fuel. When it shows up in oil analysis in the RS4 this is due to fuel dilution.
Aluminum and Silicon are from the cylinder walls, which are high strength Alusil, a high silicon aluminum alloy. These numbers will reduces as the engine breaks in fully.
Copper comes from the bearings in the engine. This should drop over the next 5K miles. If it does not, it indicates a problem.
