First post...I bought this Civic with 92K miles. The PO had done 10K OCI with whatever brand 5W-20 the quick lube places put in it. I put M1 5W-20, 20% MMO and a M1 filter. I used the MMO only for this change to clean out the engine (I had great luck with MMO on a 1995 Geo Metro with 200K+...