I rev and redline often so high HTHS is very crucial to me.
Engine oil should be replaced every 6 months regardless how little miles was driven.
Because I travel more than 5000km in 6 months, I use full sync oil to have longer changing interval.
For Castrol Edge Sport 0w-40(i think this is what I got), around 10k-12k, I replace the engine oil with new filter.
Is funny, I didn't know Castrol 5w-40 HTHS was that low at 2.9. But you can't meet MB229.5 if cp is lower than 3.5.
And they didn't mentioned Ash% & Sulfer%.
Besides on HTHS value, my minimum oil requirement of:
ACEA A3/B3 (not A3/B4, which I believe is newer spec oil with Group III base stock)
MB 229.5 (again, not 229.51, which is newer oil)
Thinking to switch to Penzoil on my next oil change. How can I order ?