Here's the latest UOA for M1 AFE in my Civic. It looks pretty darn good with the exception of the high Aluminum reading and a KV100 that I wish were a bit more stable. Driving is "extra-urban" with fairly frequent long trips of 100mi+. Oil was changed 73 miles after the OLM read 5%. As others have recently noted, AFE has excellent TBN retention and I could likely run it longer. The car is still under warranty and I like the convenience of following the OLM, so please refrain from comments about ROI and drain interval. If I wanted to save money the best thing to do would be to stop doing UOA.
The KV40 came back at 34.4 which along with the 7.3 KV100 calculates out to a VI of 185. My last two UOAs indicate how difficult it is to measure VI accurately. This KV100 is a whopping 2.8% higher than the previous one and the KV40 is 4.6% lower than the previous sample. Both are likely within the measurement accuracy yet the calculated VI for this sample comes out to 185 while the previous sample comes out to 164. Average the two and you get a VI of 174.5, spot on the virgin VI of 173 claimed by Mobil.
I'm not sure what I'm going to try next in the quest to eliminate the Al wear. Possibly a thicker oil, possibly nothing. I think I might take my next sample with 10% left on the OLM and get the report back before changing the oil. Depending on that report I might substitute a quart of M1 AFE 0w30 for the 0w20 in the next change.
Previous UOA thread is HERE for discussion reference.
The KV40 came back at 34.4 which along with the 7.3 KV100 calculates out to a VI of 185. My last two UOAs indicate how difficult it is to measure VI accurately. This KV100 is a whopping 2.8% higher than the previous one and the KV40 is 4.6% lower than the previous sample. Both are likely within the measurement accuracy yet the calculated VI for this sample comes out to 185 while the previous sample comes out to 164. Average the two and you get a VI of 174.5, spot on the virgin VI of 173 claimed by Mobil.
I'm not sure what I'm going to try next in the quest to eliminate the Al wear. Possibly a thicker oil, possibly nothing. I think I might take my next sample with 10% left on the OLM and get the report back before changing the oil. Depending on that report I might substitute a quart of M1 AFE 0w30 for the 0w20 in the next change.
Previous UOA thread is HERE for discussion reference.