Quote:
Originally Posted by Redd
Here's proof that you should warm up your car.
Top pic are my rod bearings at 90k kms shortly after I purchased it. The car was in generally rough shape and it was obvious the PO had not taken care of it.
Bottom pic are my rod bearings when they were replaced earlier this May 2026 after 80k kms / 10.years of use. The main difference - I always warmed up 1 min from cold start, at least 15-20 seconds from warm start, and I maintained below 3k rpms until oil temps reached 85C.
So yes, warm up your cars.
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I have a 2013 M3 with the S65, an engine with known rod bearing issues. And I rarely warm up my car.
And I drive my M3 year round, from 105 degree summer days to 0 degree winter nights.
Occasionally in the winter, I warm it up for a few minutes if I need the windows defrosted. Otherwise, I just get in and drive off, even when it's 5 degrees outside. The warm up time is as long as it takes for me to buckle my belt, and queue the song I want to listen to.
My car has 160,000 miles,
with its original rod bearings, running just fine.
Having said that, I keep the RPMs pretty low until the oil temperature rises to a suitable point, which could take a while on a cold winter day. Other than that, I just get in and drive off, every time.
So,
maybe, your rod bearings looked like that for a different reason.
Plus, I'm fortunate to also have a twin turbo G82 M4, and if I'm ready to turn the engine off
right after a super aggressive drive with lots of near-redline shifts, I will occasionally let the car engine run for a few minutes, out of sheer habit. But when I don't, and I just the turn car off right after an aggressive run, the car fans stay on for a while doing their thing. Modern turbos have all those computerized fans for a reason.
Oh, and my M4 has 120,000 miles. Yeah, I drive my cars.
