I have a 95 civic with a D15B7 carburated engine. It runs fine, pulls strong but I have recently noticed oil reduction and smoke above 6k RPM.
I bought this civic last year, it is only driven on petrol although it came with CNG installed that I removed. The engine was running on ZIC 20W50 oil and I changed it to Shell Helix HX6 10W40 when bought.
What do you brothers suggest I should do with this engine? I'm tempted to try some additives like Liqui Moly MoS2 first to try and stop the oil reduction issue. Could this issue be something other than piston rings/valve seals?