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I'm similar with Curtis. No oil consumption. I do add 1/2 qt to 3/4 qt during 5k mid-term (between full oil change) filter change because i do lose some oil during the filter change. To minimize the loss, I try to do it early morning when oil is cooled and I raise the front. Also helps with...

Thx for the comments. The RX is '05. I noticed that with valvoline, the engine seemed to run smoother than with Mobil. No official tests though. As for the filter, I've been using PureOne up to now, but reading some blogs, it seems that the filter might/may reduce oil flow, so thinking about...

Some suggestions would be appreciated. I own Lexus RX330, little over 50k. I've been using M1 full-syn oil and recently changed to valvoline full-syn. I liked it better, and was wondering what everyone's opinion was. I change the filter (Purolator Premium) every 5k, and the oil every 10k. I live...