Replacing engine oil from 5w-30 to 0w-40

[AKRM2C]

Hi everyone. Im planning to switch to 0w-40 from 5w-30 on my next oil change. Is there anything to do differently other than an engine flush? Thanks!

[KurtsM5]

I wouldn't flush it because I was changing weight.

[M5Rick]

Water thin flush oil could impact on the rod bearings also running the engine on it while stationary.

[AKRM2C]

Sorry M5Rick dont understand what u meant.. do you mine re explaining? Thanks!

[Blaxwil]

Any mods do you have? Are you tuned? What region of the country do you live in? Lastly, what is your primary reason for wanting to change your viscosity?

[AKRM2C]

Im all the way from indonesia, where its mostly hot and humid. Changing because i felt more confident in 0w-40

[M5Rick]

Originally Posted by AKRM2C

Sorry M5Rick dont understand what u meant.. do you mine re explaining? Thanks!

What I'm saying is its not good to flush M5 engine with flush oil, it's very thin so just change to your chosen oil.I would never use flushing oil on mine.

[AKRM2C]

M5Rick thanks for the info man!

So youre saying just replace with a different oil viscossity and theres no need to do anything else?

[M5Rick]

Originally Posted by AKRM2C

M5Rick thanks for the info man!

So youre saying just replace with a different oil viscossity and theres no need to do anything else?

Exactly. Just drain the old oil out preferably when its hot and remove the oil filter casing, its a big engine so takes a while to drain out completely probably an hour actually to just drips then after replacing the oil pan nut with new washer and installing new filter fill with 9.5 litres of your chosen oil and check it off with the electronic oil capacity gauge and tick off the oil change service space on your dash menu.

[M5Rick]

..and now someone thinks I'm a spammer, nice.

[AKRM2C]

Dont worry i voted u as not a spam haha. Thanks a lot M5Rick very much appreciated!!!🥂

[M5Rick]

Originally Posted by AKRM2C

Dont worry i voted u as not a spam haha. Thanks a lot M5Rick very much appreciated!!!🥂

Cheers AKRM2C

[KurtsM5]

Originally Posted by M5Rick

..and now someone thinks I'm a spammer, nice.

What??? Someone needs to eff off.

[Blaxwil]

You could swap to a 5W/40 with no issues.

[M5Rick]

Originally Posted by KurtsM5

What??? Someone needs to eff off.

Definitely !

[KurtsM5]

Mine has 5/30 in it since last change in Ga. Now I live in Florida, going to 5/40 next change.

[Trooper576]

It's not necessarily about weight of the oil, more so about the approvals and additives. S63 calls for BMW LL01 FE oil in particular, but regular LL-01 works fine. I use Liqui Moly 5w-30 Special Tec B FE

[KurtsM5]

Originally Posted by Trooper576

It's not necessarily about weight of the oil, more so about the approvals and additives. S63 calls for BMW LL01 FE oil in particular, but regular LL-01 works fine. I use Liqui Moly 5w-30 Special Tec B FE

https://www.mobil.com/en/lubricants/...bil-1-fs-5w-40

Specifications and Approvals



This product has the following approvals:

AVTOVAZ (LADA cars)

BMW Longlife 01

[M5 Hayden]

I believe 0w-40 will give your rod bearings a better protection if you live somewhere that’s cold or you’re someone with a heavy foot/tuned