I use Motul specific 2290 5w30 full synth, I'll check oil level evey 3000km and add a little if needed, it runs ok
Owner reviews for engine oil
My 2019 consumed maybe 1/2qt for the first two oil changes. Swapped to Liqui Moly last 2 changes and been zero oil consumption.
Using Redline 5w-50 on my E90 M3. it's supposed to have a similar viscosity at high temps as most 60wt oils. Comes up to operating temp faster and doesn't overheat.
my personal analysis’ on my s54 over the past 7 years using LM 10/60 have all been perfectly fine with low wear numbers.
I've been using the original castrol 10-60 oil and then more recently the BMW M TwinPower 10-60 oil for the last 10 years on my e46 M3.
I was running Castrol 0w30 European formula in my 07 323i and the car ticked a lot and made noises I’ve never heard it make previously when running 5w30. So recently I swapped to castrol 5w40 European formula and the car is whisper quite even on cold starts. It just sounds so much healthier.
Amsoil allegedly is the best. I use it in everything and no issues so far.
I used to do Motorcraft 5w20 but I ended up switching to Mobil 1. It just performed better in the car and made the engine run smoother and quieter.
I've used both and have put over 50,000 miles on my B46 (b48) without any issues. I think the liqui moly might be a little quieter, but otherwise no difference I can find. I would not put a heavier oil than the engine was designed for. These engines are a little noisy IMO but that doesn't mean anything is wrong. I actually think mine is quieter now at 88,000 then when I bought it at 34,000.
Not certain what Castrol makes for a synthetic, but I know I experienced white foamy build up on my oil cap on a previous vehicle using Castrol. Switched oil and it stopped.
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