I love M1 15w50 so I guess I fit into it's cult personality.
I've used it on the m5, in a 2008 subaru legacy GT and did a UOA on it (beautiful), and in a 99 porsche boxster.
For engines harder on oils, or that prefer a bit more viscosity, I find it to be my favorite "9 month" oil. I don't want...
Factory recommended viscosity is 10w60 (there was a short time where they recommended 5w30 after a piston re-design, but BMW issued a TSB going back to 10w60).
To that effect, they specifically recommend Castrol's 10w60.
I find the premise that the car requires an oil produced in the late 90s...
Normal bought in Wal-mart 15w50 synthetic
I'm not planning on extending much, though I feel safe in running it to 7500 miles. This engine is pretty stout, but it's also reallly reallllyyy expensive when lubricated parts go wrong I like the extra buffer.
Normal oil consumption for these...
I don't like M1 0w40 in this application, as I feel it doesn't leave enough film strength "margin of error" for the rod bearings after extended use. I.e. 5000 miles of VII breakdown + engine wear on the oil itself + 100 degree ambient temps + lugging the engine
I love M1 0w40 overall - I've...
2001 BMW m5, owned since March 2012 with 103k miles on it. Vehicle history is incomplete but had 5 owners before me and probably a hard-driven life, but condition of the vehicle (and cost of the modifications on it!) indicate it was at least well taken care of throughout it's life.
OEM air...
Overkill - yeah, I've been reading the same thing. Regardless, I'm not a fan of 5w30 or 10w60 in the engine (unless racing, then 10w60 makes sense to me). I like the mid-range - 5w40, 10w40, 15w50....
Joe
You are thinking of the rings - and no, 5w30 still isn't fine to run (though plenty have run it fine for a long time).
The rod bearing issue has only begun emerging on very high mileage models.
With tuning, there is no way I would run anything dropping into a 20 weight in my engine. And yours is very well tuned if you are producing 242whp.
Look at my 2 10k runs with PP 5w30 (the last 2 runs that were ~10k miles in total). Even in my car, with all my highway driving, it sheared down to...
It's just one of those things man - for some people, they get consistently higher silicon numbers with a K&N than a more traditional, quality air filter.
Now, that being said, this board is infamous for freaking out over something cause a 2ppm chronic difference when in practicality it's a...
Uh oh - here comes the REAL controversy...
I've been running a drop-in K&N filter on EVERY analysis shown The same one. Cleaned once every 20-30k miles, no more frequent.
Btw, yes, this was 0w40 API-SM - just checked my leftovers in the garage.
I deliberately LIKE the M1 0w40 because within 2k miles it's a heavy 30 weight. I don't want a 10w40 which will maintain a solid 40 weight throughout the cycle. Hope that makes sense.
...
Last thing - The M5 will likely...
Bluesubie - I'm pretty sure this is my pathway:
Sell the Boxster for ~$8500. Use that money to buy the M5 (along with savings/possibly a modest loan).
Ensure M5 is well sorted while keeping the civic SI.
Once sorted, sell the SI for $6-7k (it'll have ~120-130k miles on it at that point).
Use...