Interestingly, the 2021 330i manual specifies SAE 0W-20 or SAE 0W-30.Yea, and your owner's manual is 20 years old.
You think BMW would suggest 5/30 if the E46 was built in 2020?
No, they would not.
Is the logic is '' thicker oil- less lose trough gaps''? True is there is no direct relativity. In fact, you could get lower consumption with thinner oil, as well as different results depending on which oil of same viscosity you use. But now we are talking about engines which are far from their nominal condition, as oil consumption on healthy engine (e46 engines; we do not take modern ones now) should be ''0'' no matter what oil we use.I would have thought the opposite for turbo.
PS, I use 5-40 to cut consumption.
I'm with you on 0W-40! i'm in warm climate with 206k miles now.
i use Refline 0W40 in my Dinan modded car. It loves itManual states anything between 0-15w/30-40 is ok as long as it meets following requirements ACEA A3/B3 & API SL or higher.
Just be careful some 30 weight are closer to 20 which can't be used and they don't meet the requirement anyway.
You might think that. I might think that. But, as we know, BMW says an M54 that consumes 1 litre per 1,000km is within specification....as oil consumption on healthy engine (e46 engines; we do not take modern ones now) should be ''0'' no matter what oil we use.
It is not what I think. It is simple fact. And let me repeat: healthy engine shouldn't burn any oil. Period. And that ''1l to 1000 km'' is within specification - I do not know where you found that info regarding M54, but I believe you could see it through some BMW documents, and it doesn't surprise me - as I saw with my own eyes ''800 ml per 1000 km'' for Mercedes (cannot find it now to specify for what engine). And now let me start a theme I tried to stay away from - as it is difficult to stay calm once we step on this path.You might think that. I might think that. But, as we know, BMW says an M54 that consumes 1 litre per 1,000km is within specification.
(Though a cynic might say that's to get out of any warranty claims on used sales.)
I did clearly understood your post, did you understand mine?I think you misunderstand my post. The fact is the M54 typically uses oil, and that BMW say that's normal. So we look to ways to lessen the consumption. What we think should count as healthy is moot, it's not going to stop the consumption.
I absolutely agree, those religious-like fights about what oil is better has not much of a base rather subjective thoughts.I have always found the oil debate rather amusing since it is very subjective. I have yet to see any measurable, objective data that compares oil performance on any given engine. I use the oil specified by BMW for my 2006 M3, Castrol Edge Professional 10W-60 and change it every 7,500 miles. I sleep well at night knowing the smart engineers in Germany have specified the correct oil.