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The way I look at it is that Syn oil is better than Dino oil in the long run. You need to do less oil & filter changes, which means less old oil & filters to be disposed of which is better for the environment. The turning point for me was my wife's car which is a 03 Cooper S, it has a 25,000 km oil change frequency! If its good enough for BMW it works for me. Having said that due to the cars short trips I change the oil & filter once a year and use Castrol Syntec 5w-30.
My own car a 09 Vibe 2.4 stick uses 5w-20 Mobil One and is Changed twice a year, it is supposed to be done every 8,000 km but I go a lot longer than that due to the long Vacation trips we take. I have done this since the first oil change.
My bike which is a 00 W650 uses Kawasaki 10w-40 Syn oil is done once a year just before I put it to bad for the winter. I use the bike for commuting to work which is about 30 km each way.
I just think Syn oil just makes more sense all around.
Neddy.
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