Do I need to show you my bottle of Red Line 20w-50? Lowest temp I've ever seen here is -19°C. I'm not that far from Denmark...
I have absolutely no reservations about 15w40 for use down to -10°C but as I said it will not meet any stringent specs unless it's an HDEO. And that's what worries me more. Does LL-01 or MB229.5 have more stringent sheartests than Acea A3/B3? That will be the most likely spec for a common 15w40 here, and nothing else. Some might have a MB229.1 spec though.
The HTHS for the 15w40 would undoubtedly be higher than for a 5w40 HC-synthetic, at least initially.
I have absolutely no reservations about 15w40 for use down to -10°C but as I said it will not meet any stringent specs unless it's an HDEO. And that's what worries me more. Does LL-01 or MB229.5 have more stringent sheartests than Acea A3/B3? That will be the most likely spec for a common 15w40 here, and nothing else. Some might have a MB229.1 spec though.
The HTHS for the 15w40 would undoubtedly be higher than for a 5w40 HC-synthetic, at least initially.