Sino sa local installers other than Stargas Phils (Prins system) may lubrication option for the valves? Sa research ko for my forester, failure to put lubrication is the no 1 reason for cylinder head damage. Most installers overseas forego this procedure because the engine has "hardened valves" already. May flash lube na ba sa atin? http://www.flashlube.com.au/en/valve...t/lpg_cng.html