SOLVED: page 5, post #103:
https://www.m3post.com/forums/showth...1808462&page=5
Complete walk through with part numbers on what i did and how i did it:
https://www.m3post.com/forums/showth...2#post27658872
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Hello everyone, I don't post much unless I'm truly stumped.
This is my 2nd E90 M3, so I have something to compare it to - same year, same trans, same set up, and similar mileage (kind of). I always give about 2-3 min for the car to warm up and do not rev passed 3k until oil temps near 210 and rev limiter is completely down.
Previous E90 M3:
2008, 6spd, 3 owners, OEM WPC bearings at 36k miles, stock cooling, 2 auto-x, 2 track days, purchased with 75k miles sold at 112k miles.
Temps were pretty "normal/average" except for the summer of 2018, looking back, this seems pretty normal and acceptable to me now:
https://www.m3post.com/forums/showthread.php?t=1513213
Current E90 M3:
2008, 6spd, 4 owners?, VAC bearings at 85k @ MRF, CSF radiator, new water pump w/ metal impeller, PO had it for 5 years as DD, purchased at 143k miles, currently at 144K miles. Engine does not make funny sounds, no knocking or unusually loud ticking or clanking or anything. Engine has Alpine stage 1 tune. Everything else is stock.
During my test drive, temps were fine. Drive home - 60ish highway miles, temps were fine. In a few days, oil temps started to catch my eye because it would start to pass 210F with normal street driving.
1st incident - 02/18:
Street driving around town
not going passed 4k rpm
normal driving, not pushing or driving "hard"
day, 68F outside temp
A/C off
oil from Nov. 2019, estimated 138k miles
2nd incident - 02/19:
Highway, cruising under 70 mph
trying to keep it at or under 3k rpm
normal driving, not pushing or driving "hard"
uphill
night, 57F outside temp
A/C off
oil from Nov. 2019, estimated 138k miles
3rd incident - 02/22:
highway drive to work and back 40 mile round trip,
idling in garage before shut off
normal driving, not pushing or driving "hard"
morning, 68F outside temp
A/C off
liquimoly 10W-60 oil change
4th incident - 03/02:
highway driving
normal driving, not pushing or driving "hard"
tried to stay above 3k to keep air flowing after reading a member say the S65 needs to have air flowing, not under 3k with load.
afternoon, 74F outside temp
A/C off
lqiuimoly 10W-60
5th incident - 03/06:
highway driving
normal driving, tried to keep above 3k again
morning, 53F outside temp
liqiuimoly 10W-60
6th incident - 03/13:
idle, after filling up gas tank
night, 52F outside temp
city driving, tame not pushing
liqiuimoly 10W-60
7th incident - 3/16:
Documented this from start up to shut down.
Oil gets to operating temp in about 5-8 min, is this normal ? Given the outside temperature was 39F
the freeway entrance is less than a mile from my house, this is after a mile or two on the highway:
still on freeway:
just exited (youd think it would cool down):
drove about a mile, idle, waiting to turn left, temps still rising:
got to work, temps when down as soon as I came to a stop and idled, then parked:
left work and drove about 1/4 mile, no A/C, no high revving, pulled off into some parking lot:
creeping out of the parking lot, temps dropped (i dont get it):
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A little hard to see but temps stayed this way for the whole 22 mile highway drive home, normal 6th gear cruising, no high revs or abrupt acceleration (i felt if it was hotter outside the temps would have reached the same as incident 4):
pulled in to my garage and idled, bimmerlink shows temps at 225F at 38F outside temp:
Later in the same day, had to run errands a bit after i got home. Car sat for about 5 hours, here is a cold start at 12:59 PM:
At 1:09 PM oil temps were covering the "2" in 210, is that considered operating temp? At 1:15 it was here:
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Stopped and idled at Whole Foods waiting for my groceries and temps climbed a bit while sitting:
Drove about 1.5 miles to Chic Fil A, stopped and idled, waiting for our food and temps climbed again while idling:
The whole drive home, i probably hit 2 red lights, temps stayed here:
Pulled into my garage, idled and temps went up again:
From what I've gathered, it does not matter if i street or highway drive, my temps will go higher than usual. More so when i am at a stop or idling, it seems. I do not drive the car "hard" while I'm trying to figure this out and i always warm it up and drive under 3k after a cold start till the engine is warm. Engine seems/sounds healthy, feels as good as my old one. Except in this weather, my old one never did this. I've also asked friends who have the same car and they comment on how strange and high my temps are.
Also puzzling when I'm just highway cruising, no A/C, with relatively low outside temps, that the car oil will still rise. And continue to rise or fluctuate, even when exiting the freeway or from light to light. 240F is the highest ive seen it, from normal driving during a 75F degree day.
I understand at a stop/idle there is no airflow, but i don't understand why its rising so high. Engine has zero load so i imagine temps would go down to "normal" each time. It drops sometimes when the fan is blowing on its highest setting. Most times I park the car in my garage, the fan is still blowing for a few min after i shut the car off.
VAC bearings have 59k miles on them (done at 85k and i am currently at 144k), I'm going to replace them soon. Oil cooler has some dented fins, going to try to straight out and clean them and after reading enough threads on aftermarket oil coolers, i don't think that will help me? any thoughts? Contemplated the oil diverter valve but most say its not good for a street car as oil temps will take too long to rise, esp. in winter. I've read in other threads this could be main bearing wear? I really hope that is not the case. Sorry for the essay of a post. Any insight will be appreciated.