Hi everyone, this is my first post here. I have a 96 vienta touring that will sometimes lose power and blow heaps of white smoke. I can smell fuel when this happens and it seems like it's misfiring. She's done 460k kms so she's an old girl. Engine is a 3VZ-FE. I'm trying to keep her going for another 6 months to a year if i can. Me and my mate who's a diesel fitter did a bit of work on it last weekend to try and fix it. Changed the spark plugs and leads, front rocker cover gaskett (it was leaking oil a bit), oil filter, fuel filter and air filter. The fuel filter was filthy as crap, ran some water through it the way the fuel goes and it came out black and silty. My car ran sweet after this for about 2 days (better than it ever had). But now (a week later), it's back to blowing smoke fairly often. Driving to work this morning it blew heaps of smoke and I went from 3/4 full to just over half a tank of fuel in 10 minutes of driving. Then today at lunch time I drove it a couple kms down the road and back and it was fine. My diesel fitter mate thinks that the valve seals are gone and oil is getting into the chamber and causing it to misfire. There is what looks like oil leaking out of the exhaust manifold at the front (i'll get some pics if i can) which seems to support this theory. Another mate of mine who knows a bit about cars thinks it could also be a sticky valve. When it happens i go through so much fuel that it seems like it's just constantly dumping fuel in. He thinks the "oil" coming out of the exhaust manifold could be fuel mixed with crap out of the cylinders (judging by the old fuel filter there could be heaps of crap in there). I bought some Morey's Heavy Duty Oil Stabilizer today which hopefully will stop oil getting past the valve seals (if that is the problem). Does anyone know what could be causing this? I'm really hoping the oil stabilizer works and I can just keep changing the oil and putting that in every month or two for a while. If that doesnt fix it, would it be hard to fix a sticky valve? cheers, Ashy.