For anyone interested in the background info to this post this link will fill in the blanks of how we got to here - the UOA's! http://theoildrop.server101.com/forums/s...5850#Post940841 Now down to tin tacs. UOA's came back today which raises a few questions that I need your help with! First things first! The results! http://s9.photobucket.com/albums/a70/troutylow/?action=view¤t=TritonUOA1.jpg Heres a second view - with the evaluators comments bar scrolled to the second half of his message! http://s9.photobucket.com/albums/a70/troutylow/?action=view¤t=TritonUOA2.jpg In case those images aren't clear, heres what the results were:- Oil Kilometers Travelled 10,000 Total Kilometers Travelled 90,000 Oil Brand Pennzoil Oil Type Diesel LongLife Oil Grade 15W40 Oil Condition Normal Visc 40 121.6 Visc 100 N/A Water 0 Soot 169 Solids N/A Fuel N Glycol N/A Nitrates 56 Oxides 41 Sulphur 45 TAN N/A TBN N/A Fe 20 Cr 2 Pb 5 Cu 1 Sn 1 Al 3 Ni 0 Ag 1 Mn 0 Si 2 B 1 Na 3 Mg 25 Ca 3135 Ba 1 P 1117 Zn 1275 Mo 1 Ti 0 V 0 Cd 0 PQI 3 W N PFc - K 1 SYN SAE SAE Evaluator Comment:- IR ran using Penzoil Long Life LA due to limited information this time. Please supply exact oil information (LA or MA)? Viscosity is at the upper specification limit possibly due to the soot content. The oxidation, sulphur and nitration are slightly high. Is this component operating within the normal temperature range? The soot is slightly high Check that the engine boost pressure is within the manufactures specifications. Has this had dusty/restricted air filter elements? Suggest try reducing the service interval to clean the engine up. Suggest verify that this oil meets the API specification requirements of this engine type. Monitor chrome and lead in following samples for changes. More samples are needed to establish a trend. For evaluation enquiries please call : Call Robbie Taylor 0417 929 086 or Eddie Pyle on Ph 08 9377 9760 Customer comment:Engine fully rebuilt 90000 kms ago. uses oil and blows smoke - oil filthy black. So..... To my questions... 1. What the heck do they mean about supplying all the oil info next time? LA or MA - they say they ran the Infra Red Scan based on LA...because of a lack of info. I cannot see any info about LA or MA on the jugs the oil came in! Heres a couple shots of the labels on the jugs with all the details - what is he asking me to tell him with this LA / MA information?? http://s9.photobucket.com/albums/a70/troutylow/?action=view¤t=Pennzoil1.jpg http://s9.photobucket.com/albums/a70/troutylow/?action=view¤t=Pennzoil2.jpg I don't know what info he wants. As already explained - I've changed to Mobil Delvac 1 synthetic at this last oil change - but i will get the service manual and check that the oil (pennzoil in this UOA AND the Mobil Delvac 1, meet the manufacturers API specification for this engine! I will also change the air filter just for peace of mind, it was new at the rebuild 90,000 km's ago and been blown out with compressed air at each oil change since, still looks oK - but I'll change it ASAP just so theres no argument. The engine does run at normal temps - I've chedcked it with a thermomenter against an identical vehicle driving alonside each other under different conditions - it's within a couple degrees C at every check! Soot is high - no shyte sherlock - what have I been saying! Viscosity is at the upper limit possibly due to soot?...that would indicate the soot is possibly aglomerating no?... The boost is set just a whisker above manufacturers specs... Will monitor Chrome & lead in next samples to assess wear - Will also probably shorten the change intervals back to 5000km's (3000 miles) & run an Auto RX cleaning cycle or two and see if that helps clean things up any. 2. Anything else I should do? 3. Do the results give any clues as to what might be wrong other than what is in the asessement? 4. Does it look like a good UOA analysis service? (I was a little dissapointed the TBN numbers weren't checked - I am advised I have to buy a more expensive testing kit next time to get TBN testing done (this came standard with the Oilguard tests I was getting done stateside)! Many thanks again! Cheers!