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Indeed true about the clearances. I compared the rod and main clearances in my wife's 2005 Duratec 2.0 , my old '85 Mercedes diesel 3.0, and a 1959 vintage aircraft engine of 540cid. I verified that this unlikely group of engines all share overlapping rod and main clearances. In the order...

2k to 2.5k a month sounds like mostly highway miles. Did I get that right?

Thanks for great UOA's! What a great oil. Heavier oil in a Focus? Sure. I looked in a 2006 Focus owner's manual published for UK model owners. The recommended oil grade was 5W-30 for the very same Duratec 2.0 that NA owners are told to use 5W-20 in. Also the factory OCI over there for that...

Originally Posted by VQLT can I extend the OCI for an older car if I use today's modern oils? I have a 2005 Scion XA that recommends 6 months or 5k miles but that is based on oil technology from 15 years ago (which I believe was SM rated oil). with new oils can I extend the OCI? I went to...