OK, oil analysis is neither simple nor my specialty. Here are the details from the last seven changes I have done, with an analysis at each one.
http://www.neuralfibre.com/paulfiles/Cruiser_Oils.xls
Technical info can be gleaned from links below or Google.
This analysis is not perfect or definitive. My motor is not factory and fuel system hasn’t been touched possibly ever (250,000km). I have changed multiple variables each time (oil, filter, driving style etc)
What I read into this analysis is
- I need to try 10,000KM filter changes, 5000 seems to be nowhere near capacity of the filter
- Mineral oil is fine at 15,000km, could go longer. 5000 is a total waste of time and money.
- Soot is the problem and it’s below 1micron. Very small. Hard to filter out.
- An additional filter *may* help, but would need analysis to prove if it’s effective.
- Although the factory Toyota filter appears to be far better constructed, it doesn’t perform any differently when changed at 5000KM, possibly worse from some of these numbers. I suspect if has far great capacity.
- Anyone that talks oil without analysis prob has no idea
I’ll do some more testing, but it’ll take a while. I have a small diesel car for short trips now.
I am using sample kits from Castrol Labcheck at about $40 ea from Qld Diesel Spares. At $100 an oil change if I go from 5000 to 10,000 changes it pays for itself. Plus it’s interesting.
Have you gone to 10,000K changes? I read on another forum that if you filter to less than 1micron you take out the oil polimers that keep the crap in suspension. There is so much conflicting info out there!
Is there an update to this and filter internals.Sakura is made in same factory as genuine toyota.
Thanks for your effort