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I use the same all the time...10W40 Mobile atm.....some other i know use Motul Turbo Oil if you want it that much better...but the 10W40 seems right for me and i dont thrash mine and that oil is not the expensive, so i dont see a prob with it. Like all oils change it often.

I use, and have used mobil 1 synth-S in my rb20, and my rb25 for 2 years before that... I have had no problems and think its a good mix between price and performance if changed regularly.

But if you are concerned about maximum engine life (probably long after you've sold it), running motul or mobil 1, etc would be the better option.. although you have to be prepared for double the price every change.

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