- Sep 26, 2014
Next UOA for my classic Saab 900 turbo 16. (B202L, 16 Valve DOHC with hydraulic tappets, Garrett T3 turbocharger, Bosch LH-Jet multi-port injection, oil change volume ~3.8 to 4 litres, total volume including oil cooler 4.5 litres.) I had done an UOA on the Shell before, but I was starting to get a bit worried about the hydraulic lifters making some noise when not hot. (Drive 600km Autobahn at or in excess of 120-130km/h, leave the Autobahn and idle at the end of the off-ramp and everything is fine. Then drive 15 minutes through town and the ticking starts. Cruise smoothly over B-roads, it will tick at idle. Very spirited drive on a winding mountain road, silence. Coast downhill, ticking...) OIL Shell Helix Ultra 0w-40 MILES IN USE 6524 (10497km), 5.5 months MILES 373837 (601503km) SAMPLE TAKEN 17/03/26 FILTER: Mann w712/80 wear metals (mg/kg) IRON 12 CHROME 1 TIN 1 ALUMINUM 1 NICKEL 0 COPPER 6 LEAD 2 MANGANESE 0 pollution (mg/kg) SILICON 11 POTASSIUM 2 SODIUM 4 WATER (%) <0.1 IR-GLYKOL negative FUEL (%) 0.86 Additives (mg/kg) CALCIUM 2207 MAGNESIUM 11 BORON 48 ZINC 949 PHOSPHORUS 779 BARIUM 0 MOLYBDENUM 52 SULPHUR 1797 state of oil: visc. @40°C (mm2/s) 72.61 visc. @100°C (mm2/s) 13.01 VI 182 OXYDATION (A/cm) 5 NITRATION (A/cm) 4 SULFATION (A/cm) 6 dispergency* (%) 89 SOOT INDEX** <0.1 BN N/A * the german word was "Schmutztragevermögen", hope I translated that right. ** the lab has introduced the "Rußindex", an in-house tool to check for soot in gasoline oil, as soot from direct-injection engines will not show correctly in the standard test for diesel oils Here is the original. On the left: Shell Helix Ultra, Shell Helix Ultra again, then Aral Super Tronic, to the right Mobil1 "New Life". More on my blog: https://turboseize.wordpress.com/2017/04...saab-900-turbo/ previous analysis discussed here: Shell, 591k: blog, bitog Aral, 572k: blog, bitog bitog Mobil1, 551: blog, bitog bitog Usage pattern was unchanged. Two to three short trips a week to the boat house (2x8km), then long-distances (2x580km) cruises over the weekend. Silicone has gone up from the last uoa. Might be due to th echeap filter, might also be the big construction side on the neighbouring lot, where they tore down a high-rise complex. Demolition work started roughly with the beginning of the OCI... The hydraulic lifter noise I was concerned about does not seem to cause any wear. I did not order a BN test this time, as the last ones showed that BN is of no concern with my usage pattern, and a BN test cost an extra ~20€... Current oil is Shell Helix Ultra 0w-30 AV-L. Some slight hydro noise upon startup, but once warm, the engine is silent. Will definitely do an UOA with that oil to see if viscosity is high enough for the bearings and cylinders/piston rings. But with the AV-L being ACEA C3, it must have HTHS >3.5, so the bottom end should do ok...