Hi all, i was encouraged to get a UOA based on this thread. here are the results. The last part of the test looks different than other UOA's that I've seen, anyone care to explain what ST, OXI, NIT, SUL, W, A are?. To my uneducated eye it looks like everything is decent, please let me know your thoughts. I was worried about Si since a previous owner replaced the OEM filter with a "cold air" intake and was considering replacing with an OEM set-up.
As a side note I have a strange ticking/knocking sound that i was wondering if this UOA would help me identify. Using a stethescope it sounds like the sound is coming from the top end at cylinder 5. I have adjusted all the valves and they are all in spec. Oil pressure light goes off immediately on all start, including cold starts. One thing that throws me is that on cold start the sound doesn't begin for ~10 seconds to a minute, (the colder it is, the longer it runs before the ticking begins) on hot start the ticking begins immediately. When i tested it without the serpentine belt the sound was louder. Based on this UOA i'm thinking that the sound is not an internal sound based on teh low wear metals? any other thoughts? thanks,
OIL Castrol Edge5w20 MILES IN USE ~5k MILES 81k SAMPLE TAKEN 02/18/20 7/21/07 Wear Metals: ALUMINUM 4 CHROMIUM 2 IRON 18 COPPER 1 LEAD 0 TIN 0 MOLYBDENUM 64 NICKEL 1 MANGANESE n/a SILVER 0 TITANIUM 8 POTASSIUM 1 BORON 21 SILICON 8 SODIUM 2 CALCIUM 959 MAGNESIUM 1181 PHOSPHORUS 670 ZINC 849 BARIUM 0 Oil Condition/Particle Count: ST 0 OXI 1 NIT 16 SUL 26 W T A N V100 9.1 V40 50.0 VI 165