Been a owner of a MX5 for about 2 years, loving it but seem to have developed one of many issues. I am curious if anyone has had any luck freeing piston rings. I have had my 80,000 km MX5 NC Burning Oil due to a faulty PCV Valve. The PCV valve must have been faulty for a while because it has polished the bore of the rear most cylinder and as a result we believe the oil ring seal maybe stuck. This is resulting in catastrophic oil burn. 1l is burned about every 500km to 700km. A compression test and leak down test has been performed and all the results are within spec (sadly I do not have the official results I am going off a mechanic I have dealt with for years and trust). This is why we believe the oil ring maybe stuck.
Has anyone ever had any luck with freeing a oil ring e.g with ATF fluid or using an Australian equivalent to sea foam.
I am quite reluctant to perform any of the above steps but at the same time I'm sadly not in the financial position to do a rebuild or swap an engine. The car drives wonderful especially after all the carbon build up was removed from intake valves and throttle body was cleaned but I am worried driving it while it burns this much oil will destroy my 02 sensors and cat.
Any input would be appreciated.