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The fact that good maintainers - like CTEK - switch to a float mode, I don't think you can hurt a battery by connecting it pretty often.

Originally Posted by BMWTurboDzl Originally Posted by MCompact I have a BMW branded C-TEK maintainer I use on my Club Sport; everything else is driven enough to keep the batteries charged. Do you remember what BMW recommended with regards to when you should use a tender? Because I had only...

Originally Posted by Espada I have got my hands on 80w 90 Gl-4 by mannol but i have got another issue my manual calls for 2.1 liters while the oil comes in 950ml bottles so i am missing about 200ml of oil as i bought 2 bottles only are the remaining 200ml worth buying a 3rd bottle ...

Originally Posted by JerryBob Here in the US, GL-5 is much more common also, but I go to the trouble of buying GL-4 online. I feel it's worth it for my Toyota manual transmission. https://www.widman.biz/uploads/Transaxle_oil.pdf That paper is what got me searching for a GL-4 for the gearbox...

CRC markets a GL-4 non synthetic. Also, Red Line MT90 is easy to find and it's a synthetic GL-4.

Originally Posted by Jimzz Originally Posted by GJM120 I'm trying to determine the correct differential fluid for my car. It's a BMW 1 Series. It isn't clear if the fluid should be GL-4 or GL-5. The parts info shows a different fluid for earlier models but the differential is the same part...

I'm trying to determine the correct differential fluid for my car. It's a BMW 1 Series. It isn't clear if the fluid should be GL-4 or GL-5. The parts info shows a different fluid for earlier models but the differential is the same part number across all years. Is there any harm in using one...

^ That may have been the case for a very simple refinery. In a more complex refinery some of the naphtha stream is blended into gasoline directly but most goes to a downstream unit (the reformer) and makes pretty high octane blending stock. There is some adjustment that can be made trading off...

Good read on octane differentials https://www.eia.gov/analysis/octanestudy/ If you're so inclined you can slog thru the full report as it can be downloaded.

Most of the higher price for premium over regular is being 'enjoyed' by the retail outlet. Manufacturing costs don't explain the big premium. Neither do spot market prices.

I've spilled more gas using a poorly made environmentally friendly gas can. The spec these things to minimise spills and emissions then let them be made like junk.

If LL01 is in fact going away & being replaced by a LL01 FE, are NA engines missing out on anything with the FE oils vs plain old LL01 ?

I've focused on the statement "Additional N20 performance.... is needed" as maybe the reason the Edge lost LL01.

Originally Posted by edyvw Originally Posted by GJM120 There are so many N51 and N52 engines in service I wish BMW would get a bit more granular and keep an LL01 spec for those engines. (or even include the N54 and N55). I'm not sure if Castrol Edge 0W40 is now not the right formula for my car...

There are so many N51 and N52 engines in service I wish BMW would get a bit more granular and keep an LL01 spec for those engines. (or even include the N54 and N55). I'm not sure if Castrol Edge 0W40 is now not the right formula for my car (N52) or if it lost the cert b/c of the N20 testing. To...

Originally Posted by GJM120 No issues with ignition whatsoever. Plugs were changed just about the time of putting in that oil. Like I mentioned in another thread, the Edge 0W/40 starts out with a 100C vis of 13.1. With that in mind, do you still think the degradation is a lot? I'm editing this...

No issues with ignition whatsoever. Plugs were changed just about the time of putting in that oil. Like I mentioned in another thread, the Edge 0W/40 starts out with a 100C vis of 13.1. With that in mind, do you still think the degradation is a lot?

The shear in the 0W/40 is not much worse or even as bad as the 5W/40 if you take into account the spec viscosity for the 2 oils are 13.1 and 14.1, respectively? Edge 0W/40 is a 'thin' 40 grade.

Humidity isn't terrible high here and the car is garaged. Viscosity drop is probably fuel dilution as mightmousetech mentioned. Looking at a recent Edge 5W/40 UOA posted on here, the vis at 100 went from 14.1 to 11.22 after 9,500 miles. So I guess my decrease isn't that severe. Certainly going...

Slow getting this out here. This was an very short change interval mileage wise. It was a year from the last change and I've been going on 7,000 miles or a year - whichever comes first. The car does often see short runs (~8 miles) Blackstone thinks I could wait longer. I do my own changes and...