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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Oil



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      09-17-2020, 12:03 AM   #1
thatblack335
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Oil

Does anyone think that I should run 0w40 in my n54 even if it is parked in a heated shop at night? It would be parked outside in up to -40 C weather during the day. I am currently on 5w40.
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      09-17-2020, 01:00 AM   #2
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It won't be any worse, and sounds like if you left it outside you could really use the lower cold viscosity of a 0w oil...I say go for it.
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      09-17-2020, 01:20 AM   #3
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Definitely sounds like a good idea to go to 0w40 for those temps. Make sure to warm the engine sufficiently before pushing it, too.
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      09-17-2020, 05:51 AM   #4
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BMW recommends 5w30/0w30 for the N54 engine. I would probably go for 0w30 if you have a colder climate, and 5w30 if you live in a hot climate year around. I'm no expert in oil but from what I have read 5w30/0w30 is the way to with the n54 engine. In your climate I would definitely go for 0W.
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      09-17-2020, 10:09 AM   #5
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Quote:
Originally Posted by thatblack335 View Post
Does anyone think that I should run 0w40 in my n54 even if it is parked in a heated shop at night? It would be parked outside in up to -40 C weather during the day. I am currently on 5w40.
Fun fact: -40 C = -40 F
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      09-17-2020, 10:26 AM   #6
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Hold on are you actually getting -40c temps or is that with the wind calculation?
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      09-17-2020, 10:31 AM   #7
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Quote:
Originally Posted by thatblack335 View Post
Does anyone think that I should run 0w40 in my n54 even if it is parked in a heated shop at night? It would be parked outside in up to -40 C weather during the day. I am currently on 5w40.
I'm from Canada and I run 5w40 liqui moly year round. My car is in a garage at night but sits outside all day. Never had an issue starting or anything.
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      09-18-2020, 12:43 AM   #8
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Quote:
Originally Posted by BMW335l View Post
BMW recommends 5w30/0w30 for the N54 engine. I would probably go for 0w30 if you have a colder climate, and 5w30 if you live in a hot climate year around. I'm no expert in oil but from what I have read 5w30/0w30 is the way to with the n54 engine. In your climate I would definitely go for 0W.
I am in Boston, and I have always put 0-40 Castrol in it. First it used to go to the dealership, but now I do it myself and since the local BMW dealership provides free fluid top ups, anytime I have needed a quart, I just drive there and they put it in. They use 0-40 Castrol too. What would be the downside of a thinner oil vis a vis 30 for our N54s? Thx for the info in advance..
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      09-18-2020, 11:15 AM   #9
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The Bentley manual has a chart of recommended viscosities for temperature ranges.
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