I had use both and i have driven more miles without needing to refill with motul. But motul > mobil one
You don't need to add any more additives to modern day oils. You said you will be using Mazda 0W-20 oil? This is one of the best 0W-20 oils on the market. It is made by Idemitsu for Mazda. It has very high Viscosity Index of 221. Most 0W-20 oils are around 170. This means it is one of the lightest 0W-20 at start up. This is what you want in the winter.
I always ran the Motul Grand Prix in my shifter, I never had any engine problems. Still run it in my dirt bike, I love the smell of it, too.
I use MOTUL for my oil.
When I changed to full ester Motul in my motorbike, there was a noticeable reduction in the time it took for the startup rattles to quieten down.
Motul is quality stuff. I had a MK5 and drove it about 90k miles and I put Motul every 5k and my car always performed well.
All I know is my dealer used 5W30 Castrol throughout my free factory serviceand I burned oil like crazy, since I have switched to Motul VW specific 5W-40 I have yet to burn anything noticeable.
I am now testing Motul x-cess which should be even better
here in hawaii i'm running 15-50 with 8k or so intervals. oil test has com eup clean. motul oil as of last oil change, pentosin before that. when i ship my car, i will be swtiching to a lighter weight as i will actually see outside temps below 70* motul FTW:beer: i say run 10-40 motul, this one.. http://www.sears.com/motul-839451-6100-synergie-10w-40-technosynthese/p-SPM7359011402P
I have used royal purple once and didnt really are for it... But now i have been using motul 8100 x-cess 5w40 on my 06 2.5l rabbit for the past 5 oil changes and it works amazing... I'm going on 6500 miles right now and it still has a yellowish tint to it, like clean oil! I do some autocross, some quarter miles, and I drive a little aggressive... This oil is awesome an I would definitely recommend it...
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