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Originally Posted by cnavarro
The post I made on Pelican pretty much sums it up, but I'll also add that using a metal filter body lets you use filter magnets that I've tested as removing all but 1 ppm of Fe in used oil. Secondly, using one of the recommended filters that don't have an internal bypass are full-flow, filtering 100% of oil, not allowing ANY particulate matter to be bypassed, with filters capable of higher flow while still filtering much finer particles. These filters are built to take pressures far exceeding anything these engines can produce, even in sub-freezing weather as we have tested.
Amsoil is good too (just don't use their european formula - it's pretty weak), so are their filters - just cross with one of the filters we recommend and you'll be fine using Amsoil's. Royal Purple also now offers some nice filters too!
As far as oils go, I'm leaning towards Swepco 306 15w40 for non-variocam+ engines. If using a factory approved oil or lighter recommended 0w40 or 5w40 viscosities, I'm also thinking about recommending Swepco's 502 Oil Improver. This boils down to the bearing analysis we had done on the IMS and their failure modes - having an oil with moly-based extreme pressure friction modifiers should improve IMS life. Royal Purple's 5w40 would be another oil as laden with moly as Swepco.
For sure, drain intervals need to be cut back to 5,000 mi / 6 months.
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how about castrol tws10w60 or castrol Edge 10w60 (not edge sport !!!)
It has extreme hths values and that's the reason why it is the only oil approved in bmw ///M engines.
I put it into my m3 and Mits. evo, an former impreza, all the time. Would love to have a single type oil supply and put into the Boxster as well. However did not dare to do that until now. BoxsterS runs on M1 5w50.
Now reading about extreme pressure modifiers (zincsulfait ???) being neccessary for the box. There are a lot of that in tws/edge 10w60. In fact the only reason tws/edge 10w60 exists next to Edge sport 10w60 is that bmw ///m didnot approve the lower zincsulfait and lowe hths values in edge sport 10w60...
Mark