1. As mentioned many times, fuel economy/CAFE. LL-04 includes 30 grades.
2. Probably fine unless you have GPF, then stick to the LL-04 5w30 ESP since it has less SAPS.
3. SAPS.
All manufacturers have done this for decades in US engine bay stickers/manuals. Short of extreme edge-cases like an extreme mono-grade in cold temps, a thicker oil will do nothing but decrease wear at the cost of 1-2% mpg. Thus in other countries you will very frequently see other thicker...
If you're using e85 it's not necessarily contact with the fuel itself that's causing that. If you're talking about carbon buildup on the outside or carbon getting past the seals that's likely a byproduct of extra combustion pressure from the combination of a tune and ethanol. I had this issue in...
my old 335i would run ~245F cruising around in the heat. not an issue at all on the LL-01 i was using at the time (probably M1 0w40).
oil isn't the problem at this point, coolant is.
Whenever mine is out of warranty (original purchaser did a pre-paid maintenance plan, the dealer comes out and changes the oil, filters, and spark plugs once a year) I'll run ESP 0w30 or 5w30.
I might look into the filter heater, I doubt we'll get that cold this year but never hurts.
Like any...
It doesn't hurt, but you're not going to see a difference unless you're really beating on it. Like, 20 minute hot lap session with no cooldown lap straight into the pits. If you've driven at reasonable speeds through your subdivision back into your garage, I wouldn't ever bother with this, it's...
Valvetrain noise isn't necessarily a problem nor correlate to wear, some additive packages are just quieter. I wouldn't run an HDEO oil in any gas engine, much less in a racing application spent mostly at higher RPM.
like Edy said, I would feel totally comfortable running 260F on an off the...