Just thought id let everyone know that its gonna be done this weekend and then sent off to be analysed. THe oil will have (car's at dealer right now so cant remember exact mileage) around 4,000-4,500 miles on it. Wanted to go 6K but, got the only chance ill have to change it for a while and well see how it does in a 2L mazda engine! Car: 2002 Mazda Protege5 2 litre 4 cylinder engine 130hp driven fairly hard and shift point for normal driving is 4K rpms and 5500rpms for spirited. Redline is 6500rpms. Oil: German made Castrol Syntec 0w-30 w/ PureOne filter. Question is, who should I use? BLackstone? I dont like having to pay an additional $10 for a TBN. Any suggestions? Thanx, chris j.