[SE7EN335]

Originally Posted by TopJimmy

You guys have forgotten that oil Winter Weight is determined by its viscosity at -22F (red line on chart). If both 0W30 and 5W30 were at +20F then they would both be 30 weight at that temp and above. Even at 0F they are both 20 weight. See the pix with info, courtesy of Amsoil.

Some 0w30 oils' Viscosity @ 40C, cSt are around the late 50s mark (BMW factory 0w30), whereas some 5w30's are around the mid 70s at the same temp range. The popular PPE/Shell Helix Ultra 5w40 is around 79. The thinner the oil is at lower temps, the faster the oil flow is and that minimises start-up wear. So it is not necessarily that a 0w30 and a 5w30 would have the exact same viscosity at +20F. There are a lot of variations to this, some 5w30s are thinner and thicker than some 0w30s and vice versa. But I sleep better at night knowing that I have the thinnest possible oil at colder temps and the thickest oil possible at higher temps

[GrannyShiftG80]

Originally Posted by TopJimmy

And since the S58 engine is so similar to the S55 and uses the same oils, this link should answer every question.
https://f80.bimmerpost.com/forums/sh....php?t=1764629

i aint readin all dat

can u pls summarize

[SE7EN335]

Originally Posted by Allenssmart

i aint readin all dat

can u pls summarize

Castrol Edge Euro Formula 0w30, Mobil 1 API SP 0w40, Pennzoil Platinum Euro 5w40 and Motul X-cess 5w40 are all great oils that can be used with utmost confidence

[TopJimmy]

Originally Posted by Allenssmart

i aint readin all dat

can u pls summarize

Stock car under warranty:
BMW TPT LL-01 FE 0W-30

Stock car past warr:
Motul Specific LL-01 FE 5W-30 or
Motul 8100 X-Cess g2 5W-40 (LL-01, A40)

Stock car tracked once or twice:
Motul 8100 X-Cess g2 5W-40 (LL-01, A40)

Car tracked frequently:
Read the long thread and look for replies by Edycol. He is an expert whose advice can be trusted. Read…do not PM him unless absolutely necessary.

For “premium quality” maintenance do things at half the factory interval, maximum. That means engine oil every 5K, plugs every 15K, rear diff and transfer case every 25K, brake fluid every 30K, coolant and trans oil every 50K, and O2 sensors at 75K miles. The coolant, ZF8 trans, and transfer case are listed as Lifetime fluids, so I took a little personal judgement there. Brakes, rotors, spark coils, injectors, and engine bearings are all only-as-needed.

If you run E85 fuel change engine oil every 2K. I just dump and fill the oil, and let the dealership do the filter changes every 10K.

[Grumpy514]

I use MOTUL 5W30. It doesn't get THAT cold around here that I would want to switch to 0W30. Coldest in winter months is usually teens, sometimes single digits but rare.

[ds555]

US cars it's Liqui Moly Special Tec B FE SAE 0W-30 - matched BMW Longlife-01 FE spec

EU cars it's Liqui Moly Top Tec 6100 0W-30 - matched BMW Longlife-12 FE spec