I will be changing the oil maybe this weekend (cold outside) and have lots of CJ-4 oil and a WIX XP. Not changing the Amsoil bypass filter. I change oil based upon the OLM which seems to be around 8000 miles. This current cycle I went two of the OLM intervals. Last time I changed the filter after the first OLM interval as it was a Ford. Now with the WIX XP I am thinking of going the full 16000 to 17000 miles. Money wise I can afford a new filter every 8000, so its not trying to save $$.