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Lowered as requested:-

This can be done with the water pump in situ? You will need to undo the bypass outlet on the head which should let you remove the bypass pipe. You will need two new orings and bypass outlet gasket and best to get a new bypass pipe. Drain coolant to below water pump level Undo two bolts holding bypass outlet Gently prise away outlet and bypass pipe Clean both o ring surfaces and gasket surface Replace o rings and gasket Torque outlet bots to 9 N.m

Hello and welcome to the LOC. Me neither sounds more like an Alfa Romeo engine than a Lexus, thing you have to ask yourself is where the oil is going? Any excess smoke? Put it this way my LS400 engine is 19 years old and has done 82,000 miles and the level doesn't move between changes. I would return to the dealer who did the work and ask more questions.

Here you go:-

@matt Here we go again.. but will i give you that attention you yearn? NO. @Michael keeping this thread on topic for you, just go onto http://my.is/ forumn and most guys are running IS300 2JZ-GE with boost. the stock 10.5:1 compression ratio from factory is too high if you boosting so will need to be dropped to about 8.0:1 or 8.5:1 to be on the safe side but as i confirmed mate give Swift Racing tuners in US a ring and hear it from the horses mouth if what I said in post number 6 is bull crap from guys on the US forumns, SRT tuners know thier stuff when it comes to boosting and most of them are running thier parts. if they confirm the 2JZ-GE can take boost on stock internals then you are on your way... have a read through this michael http://forum.clubna-t.com/showthread.php?t=10

Hehehe... I know the feeling. I just got mine two weeks ago after dreaming of buying one since 1998! I couldn't sleep the night before I picked it up :-) Enjoy and welcome to the club.