David Posted January 18, 2012 Report Share Posted January 18, 2012 Still have a bit of an issue with our Lupo. Basically i've had all the valve stem seals changed along with the oil seperator box and breater pipe. When the vavle stem seals were being done they checked the piston rings and they were fine.Still the car is smoking a little and within 6 days the oil level went from being fine after a top up to aout 3/4 full to the oil light coming on.What else could be causing this? It doesn't seem to be leaking, there is no oil under the car and it has only smoked a tiny bit!Im stumped! Quote Link to comment Share on other sites More sharing options...
Defcon5 Posted January 18, 2012 Report Share Posted January 18, 2012 Did youi do the work yourself? If not take it back Quote Link to comment Share on other sites More sharing options...
benters Posted January 18, 2012 Report Share Posted January 18, 2012 firstly i have only ever rebuilt A series engines, so not experienced in Lupo's to the same degree...but you say you have checked the piston rings, and as such the oil control ring on each ? did you pull the engine out ? did you also hone the bores after withdrawing the pistons ? its the only guess i can come up with, otherwise like you slightly stumped . . . Quote Link to comment Share on other sites More sharing options...
buxton Posted January 18, 2012 Report Share Posted January 18, 2012 (edited) check your water has it got emulsified oil in it ?? or is there low throttle response ?? Edited January 18, 2012 by buxton Quote Link to comment Share on other sites More sharing options...
1.4Josh Posted January 18, 2012 Report Share Posted January 18, 2012 I've got exactly the same problem, I'm baffled getting the pistons rings done now Quote Link to comment Share on other sites More sharing options...
Defcon5 Posted January 19, 2012 Report Share Posted January 19, 2012 check your water has it got emulsified oil in it ?? or is there low throttle response ??Highly unlikely to be HGF Quote Link to comment Share on other sites More sharing options...
David Posted January 19, 2012 Author Report Share Posted January 19, 2012 Im not sure as my friend did the work. He is a VAG technician and said there were no issues with the piston rings. The headgasket has not blown, the car drives perfectly.Question is, what else apart from piston rings failing can cause burning oil? Bearing in mind the valve stem seals have all been replaced.The car is a 1.4 16v AHW engine codeWould thicker oil help? Quote Link to comment Share on other sites More sharing options...
Defcon5 Posted January 19, 2012 Report Share Posted January 19, 2012 What oil is in it at the minute? I wouldnt go any thicker than a 40.Could be a broken PCV system? Quote Link to comment Share on other sites More sharing options...
David Posted January 19, 2012 Author Report Share Posted January 19, 2012 10w40. Was thinking 15w40?Whats the PCV system? Quote Link to comment Share on other sites More sharing options...
Defcon5 Posted January 19, 2012 Report Share Posted January 19, 2012 That would make no difference, you are unlikely to be losing oil through seals when its cold.PCV is the crankcase ventilation, if its broken I think it can increase crankcase pressure and cause oil to be forced past seals. Dont quote me on that though Quote Link to comment Share on other sites More sharing options...
David Posted January 19, 2012 Author Report Share Posted January 19, 2012 That would make no difference, you are unlikely to be losing oil through seals when its cold.PCV is the crankcase ventilation, if its broken I think it can increase crankcase pressure and cause oil to be forced past seals. Dont quote me on that thoughAny way i can check this? Quote Link to comment Share on other sites More sharing options...
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