SUNRG
Top Post Dawg
- Joined
- Oct 19, 2003
- Location
- Roanoke, VA
- TDI
- None currently. Previously owned 04 Golf TDI & 05 Passat GLS Wagon TDI
let me begin with the Inherited Contaminant Analysis, and to keep this reasonably brief i'll just analyze the inherited Fe and develop a theory from that analysis.
one bonus of pushing my previous OCI to 18,258 miles was that wear metals became elevated enough to have the inherited wear metals show up on a UOA of the newly installed oil. hence the 50 mile UOA (second entry from the top on the image below).
Virgin/Unused ELF Solaris LLX 5w-30 507.00 contains 1ppm Fe so...
since it took roughly 4.7 liters to refill this engine after the oil change, we could estimate that 4.7 liters = 89% of the total oil capacity (11% of the oil is not removed during an oil change, 89% of the oil is removed).
4.7 liters divided by 89% gives us a 5.3 liter total oil capacity. 5.3 - 4.7 possibly means 0.5 liters are not changed during an oil change.
i emphasized could and possibly above because this is all theoretical. i could not put a tracer on every ppm of Fe to determine with confidence which ones were inherited. the blue text above is an attempt to explain this data with a plausible theory.
full disclosure: my oil change procedure is not typical. i...
on to the Higher Initial Wear Theory, this will be quick...
in previous threads i've posted data that supported the SAE study findings that engine wear is high after an oil change, then after 1000-2000 miles wear rates drop - theoretically because the new oil's anti-wear chemistry becomes established during that period.
this UOA does not support the Higher Initial Wear Theory. the Fe wear rate for the oil sample interval from mile 50 to mile 2050 was 1.0ppm / 1000miles. this is incredibly low, and this 507.00 UOA is the lowest Fe wear rate i have observed for the 0 - ~2000 mile range.
finally, this is the beginning of my UOA trending of ELF Solaris LLX 507.00 5w-30 in my 04GolfTDI. i will sample every 2000 miles so we can see how long this oil will perform optimally.
cheers!
one bonus of pushing my previous OCI to 18,258 miles was that wear metals became elevated enough to have the inherited wear metals show up on a UOA of the newly installed oil. hence the 50 mile UOA (second entry from the top on the image below).
Virgin/Unused ELF Solaris LLX 5w-30 507.00 contains 1ppm Fe so...
- Fe = 55: after 18,258 miles on used oil
- Fe = 7: after 50 miles on new oil
- Fe = 1: of new oil before it was installed
- Fe = 6: this is the approximate amount of Fe the new oil inherited from the used oil
since it took roughly 4.7 liters to refill this engine after the oil change, we could estimate that 4.7 liters = 89% of the total oil capacity (11% of the oil is not removed during an oil change, 89% of the oil is removed).
4.7 liters divided by 89% gives us a 5.3 liter total oil capacity. 5.3 - 4.7 possibly means 0.5 liters are not changed during an oil change.
i emphasized could and possibly above because this is all theoretical. i could not put a tracer on every ppm of Fe to determine with confidence which ones were inherited. the blue text above is an attempt to explain this data with a plausible theory.
full disclosure: my oil change procedure is not typical. i...
- drain oil via the drain plug, and
- vaccuum extract oil from the oil filter housing, oil cooler and all the plumbing and crannies accessible with the oil filter removed, and
- use Motul Engine Clean (a motor oil / engine flush)
on to the Higher Initial Wear Theory, this will be quick...
in previous threads i've posted data that supported the SAE study findings that engine wear is high after an oil change, then after 1000-2000 miles wear rates drop - theoretically because the new oil's anti-wear chemistry becomes established during that period.
this UOA does not support the Higher Initial Wear Theory. the Fe wear rate for the oil sample interval from mile 50 to mile 2050 was 1.0ppm / 1000miles. this is incredibly low, and this 507.00 UOA is the lowest Fe wear rate i have observed for the 0 - ~2000 mile range.
finally, this is the beginning of my UOA trending of ELF Solaris LLX 507.00 5w-30 in my 04GolfTDI. i will sample every 2000 miles so we can see how long this oil will perform optimally.
cheers!