2 things for our common sense;

a.) good quality oil (multigrade or semi-syn) + good quality oil fliter (OEM, Bosch, Vic) = very good protection, long engine life (above 300,000 kms)

b.) good quality oil + an even better oil filter = an even better protection and longer engine life

*dvldoc = much better if you can post the micron filtering capacity of each oil filter (based on verifiable lab test) you can get your hands on so that we can see what can filter the best. It would benefit tsikoteers more.

It is worth noting that there are other things to consider in wear and tear of engines. How often do you crank the rig from a cold start. Meaning at least 2 hours being unused. Afterall, mostmanufacturers agree that it is during start-up that wear and tear is mostly occuring, not when oil is already circulating. This is part of the criteria, among others, to consider when categorizing the use of the car as normal or severe.