I've been using ZIC A engine oil for my 2005 honda civic exi. But I've just read in owners manual that engine oil should be "SJ or SG grade" which ZIC A is not.
1. SJ OR SG grade oil is SK ZIC which is for small engine, should i use it with my cng kit?
2. how should I change engine oil type? i've heard frequently changing engine oil will damage engine.
3. Any suggestions?