And what do you do if your car blood test is a bit off? Avoid future bad habits and get more exercise? Or add green tea?
Load it up with more medication and order more expensive tests like the GP does.
In all seriousness with these expesive cars with expensive engines an occasional oil sample report can be helpful to encourage DIY owners to investigate around the engine, find and repair or let the dealer know about some of the problems.
For example using the sample provided oxidisation is high, this is directly related to how the vehicle was used high speed and 50% heavy towing. Fuel usage was higher, higher cylinder pressure and temperatures would of been sustained longer. Sump temps may of looked ok but the oil is getting pummelled cooling the piston crowns in a turbo engine. The solution would be an earlier oil change.
The elevated sodium check resivior levels for unexplained coolant loss. However, some oils contain sodium as part of the additive package (Penrite) so also check potassium levels. This is good reason to sample the new oil product being used and not chop and change oil brands every service. Sodium can be also used as an ingredient in some fuel additives.
Partical count for metals is material from break in and wear. In a new engines depending on how it is worked this may take some time to stabilise. If there is a sudden unexplained rise time to pull covers and investigate.
Silicon, even though not an issue on this sample in a 4x4 used in dusty environments silicon is common, a very good item to monitor and in most cases easy to fix. In a new engine first sample high silicon is likely to be mainly sealants and lubricants used during assembly. As the engine ages sudden spikes in silicon are a good sign of dust ingress from poorly sealed intake systems, crankcase ventilation or major oil leaks around the engine.
Fuel dilution is a good one to check. It could mean fuel system leaks or bad injectors or on some engines excessive DPF burn cycles. Around 5% fuel in oil can start the failure of plain bearings like big ends and mains pushing 10% and above can cause some engines to fail.
A car is just a dumb lump of metal that's easier to fix from an oil sample report then us with a blood test report, a Bex and a lie down.
