Mechanic said (after taking a look of course) that it may make sense changing my piston rings while my engine is apart. Originals are about 80$ per cylinder which is costly enough. Manufacturer of pistons is Kolbenschmidt (so I believe they are for the rings as well) but parts for F4R engine will be on their aftermarket catalogue only since 2010 (this is per email from their manager), so no way to order it directly from KS instead of Renault.
What are other options there, with approximate prices if available plz.
What are other options there, with approximate prices if available plz.