New M4/ Oil

[werner]

Hello, I almost hesitate to bring up the subject of oil, it always caused wars on the IBMWR forums years ago but here goes.

I am a US Army contractor who works in Germany. This Thursday I will be picking up a 2018 Smoked Topaz M4 convertible. I went to bmwusa.com and put in my VIN to access the online manual, looking up the suggested oil, BMW states:

When selecting an engine oil, make sure that the engine oil has the viscosity grade SAE 0W-30. Alternatively, also engine oils with viscosity grades SAE 5W-30, SAE 0W-40 or SAE 5W-40 can be used.

Now my car will mainly be driven in the summer and that and on the autobahn. My assumption was that it would be better to use a 40 grade oil due to the higher heat and pressure.

Am I all wet on this? Would 30 weight be better, or is BMW trying to appease the government with better gas mileage?

Thanks

[Pelican Parts]

I would go with the 30 since that's how it comes from the factory. 40 is not going to do damage - your assumption is correct. Enjoy that magnificent car and please let us know if you have any questions!

[Reedo]

Unless you're tracking the car and really putting the engine under stress, you're not going to see any significant benefit from going to a heavier weight oil.

[MIKYZZ4]

My opinion on Autobahn and summer use only,5w-40 as suggested by BMW,
Just make sure it's a BMW recommended top grade full synthetic oil.