Thread: New Pistons / Rings ??

it may not be rings it might just be the valve stem seals. a compression/leakdown test will confirm this either way.

500ML in 8000Ks??????
That is a beauty.
It has a long way to go yet before it is terminal.
The blow by may be from a failed head gasket pressurising the valley by leaking from a cylinder into the valley.
I would think that you may have a head gasket leak plus wear in the valve guides.
I think it would be unusual to have such low oil consumption with dead rings, as I would expect that the oil rings would be as worn as the compression rings, although its not always the case.
A compression check /leakdown test may give a clearer answer, but with 230K the valves are going to leak. If it shows a cylinder well down, it will indicate a blown head gasket into the valley.
Regard sPhilip A

I agree with Philip. 500ml in 8000km is very good.

When you say black smoke only on petrol, not on LPG, that leads me to think it's running rich.

Rich running on LPG doesn't give smoke. If it was an oil issue, I'd expect it on petrol and LPG. Oil burning normally gives blue-grey smoke.

When the LPG was fitted did they move the breather upstream of the air filter and MAF sensor? If so, I'd say "tsk, tsk!"

No they moved the breather into the Airbox.... Would it be better upstream ?? Just thinking..... it's a venturi system will have to check if there is room past this ??

I did think of it potentially running rich as it using more fuel than i would expect and also it's a bit rough on idle, but have been assuming the worst

With the valve issue any idea on ballpark costs to get these adjusted ??