Honda recommends 105000 mile valve clearance adjustments on many of its 4 cylinder engines, including the 1.7 in my 05 Civic. There has been a school of thought that this is possibly far too long. In fact, severe damage to engines in Gen 1 CRVs has been pretty well documented in some forums due to burnt valves. One possible approch is just to adjust the valves earlier, which is not super expensive but not cheap either and possibly not needed. Would UOA's catch it if the valves begin to tighten up? What would one look for?