Previous owner said it was Castrol Edge 5w40 505 oil. He was fueling up exclusively with this stuff they sell in the SF area which is B20 and Renewable Diesel blend. This hippy fuel is expensive at nearly $5 a gallon. He had about 3K on this fuel and I started filling up with D2 for 3K. I guess this is the reason the soot was so high. I usually see a soot value 1/2 from this UOA on Cali D2 or pure Renewable Diesel as fuel. He was also only averaging 32 MPGs while I'm at 44.3 with D2. Car History: New to me 2003 Jetta GL. Alaska Green w/ Beige interior 272K 5MT Stock except for Bosio PP357 injectors installed about 50K miles ago. Long Beach wheels Bilstein B8 Yellow struts and lowering springs Car has many new parts including wheel bearings, N75, MAF, Alternator, Stoptech Drilled/Slotted rotors and ceramic pads, Re-sealed injection pump, Cooling fans, etc.. I found this car on craigslist for $1500 with 269K. I thought it was a scam because it was so cheap. The guy selling it was the original owner who lived in a very nice house, like 4-5 million dollar pad. He had all the maintenance records and an excel file of repairs. He had VCDS and was kinda a shade tree mechanic. He ran this car exclusively on a B20 & Renewable Diesel blend sold in the SF bay area. Tires were gone and it had a disclosed coolant leak. Also was throwing a coolant level or over temp chime alarm. It drove OK though and passed smog so I bought it anyway as I believed the guy was genuine and it was a great deal even with the issues it had. My mechanic replaced the CTS and expansion tank. Flushed the coolant and Brake/clutch fluid. He noted some wetness on the power steering hose but couldn't find an actual leak, so minor issue not needing attention. He did not recommend any other work at that time, other than replacing the tires and radiator due to their age. It has the original injection pump and turbo. I've driven it for about 3K miles. I replaced the tired Battery with an H7 AGM. It has 4 new Yokahama Avid Ascend 215/50R17 tires. I'm into it for now for about $2500. It's averaging 44.3 MPGs on fuelly. I just did my first maintenance, changed the oil to M1 TDT 5w40 + Ceratec and replaced the gear oil with 50/50 Redline MT LV and Superlight shockproof. Enjoy!