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Why would I prefer 5w50 over 15w50? It has alot more VII in it which reduces shear stability, does it not?

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...

I'll be buying an M5 in the next few months - I'll keep you updated. Are you a member of m5board.com?

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...

And the thread goes dead silent as heads explode...

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...

Originally Posted By: hooligan24 Quote: Why would I tinker at this point? "Thou shall not stop tinkering" Im pretty sure I read that in the site agreement when I signed up for this site lol - it's the car enthusiast/oil enthusiast motto. No oil is ever good enough, or proven enough, where...

Fcobra - I believe we have fairly different piston/ring designs. Correct me if I'm wrong. I tried to get oil consumption to decrease. I've used PP, RP, Amsoil SSO, valvoline, M1 0w40, and even supertech synthetic early on... None of it made much of a difference. Actually, I take that back, up...

I'm sorry maybe I wasn't clear - at this juncture, i consider the oil consumption to be a good thing, not something I want to "solve".

Buster, I'm a believer in slightly thicker oils - especially with low friction piston designs such as this engine has. So I like the "lightweight" 40 weight for this car, which obviously shears to a 30 weight quickly. Leakyseals - I'm used a ton of oils. Those UOAs also reflect Amsoil SSO 0w30...

I've been dreaming about an e39 m5 for several years. I've finished my master's degree, my wife is 8 weeks pregnant, and i'm financially able. It's time to sell the coupes and get a proper family sedan