After some research I heard people use 5w40 to quiet the motor down and lubricate the lifters better for high mileage engines. picked up some castrol edge 5w-40 and it runs buttery smooth, noticeably quieter and another big thing is oil consumption drops A LOT due to the oil being thicker and harder to burn or leak. I used to need maybe a quart a month now Ik down to half a quart a month.
I use this Castrol Edge 5w40 for 5 years already in my e46’s m54b30. No issues. Trying to stick to 10k km intervals.
In my e39 M54B30 473k km I am dumping Castrol Magnatec 5w-40.
Nothing to complain.
I use Motul classic 20W-50 in all of mine, or some generic 20W-50 oil if I can't find it. If I'm not incorrect the classic has some additives to help with not seeping out of the engine but other than that won't do anything special.
I see a lot of people recommending lighter oils but living in a warm climate this is what works for me.
Motul Xclean EFE 5w30, Xclean gen2 5w40
That said, I use Motul 0W20 in the winter and 5W30 in the summer.
I use castrol 5w-40 Euro on my 2006 Revup. Good oil pressure on hot SoCal days and burns less oil.
I send an oil sample to Blackstone Labs every single time I change the oil or the dealer changes the oil. As part of that analysis, I pay the few extra bucks for a TBN calculation. On my SQ5 and S3, after running a fill for 10k to 12k, those TBN values always come back greater than 1.0 indicating that there’s still enough remaining additives to continue running that fill for even more miles still.
I have an MX-5 with that engine, Mazda uses Castrol Edge 0w20 but you can use a heavier oil and sime say it reduces wear. The purpose of the 20 weight is fuel economy.
I just put in Motul 8100 instead of whatever the dealer was using. Haven't really noticed a difference except it's occasionally burning a bit, but I can't say for sure that it's just because of the oil.
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