I had my LC's diesel oil changed over the weekend. Same vendor/mechanic that has been changing the oil for about 4 times already. Everything was normal: drain the oil, put back on the drain plug; remove filter, put in new oil filter; and then put in the usual 10L of diesel oil. I started the LC and for about I think 2-3 minutes, vendor was yelling at me to kill the engine. And I did. Getting out of the LC, there was oil all over the floor. My first instinct was the drain plug was not filled in. But it was. The mechanic/vendor then looked again and said that it's coming from the filter. My first instinct was defective filter? But's is new and OEM-sealed from Toyota. After checking and removing again the filter, it turned out that the filter was not properly seated/locked. Mechanic thought he had tighened it enough. So mechanic re-tightened and I/vendor watched him again. Started the LC for just about 15-30 seconds just to see that LC is not spewing oil again. It's not - and the killed the engine. Vendor/mechanic then started adding oil. I thought we lost only about 2-3 Liters but they ended up adding 8 liters. We checked everything before starting the engine and there are no more leaks. Drove home for about 80 kms (after seriously reprimanding vendor/mechanic) and parked the car. Things looked normal to my untrained/non-mechanical/non-LC type of guy. My concern on the LC: how does the above affect my engine. Should I be concerned that the LC was running for about 1-2-3 minutes with very low oil? Or since it was at idle and we did not run for extended period of time, the engine should be ok. Don't flame me: I know I should be the one to change my oil. And I know I will never go back to that vendor/mechanic.