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Thanks FZ. How do I decide between 5w30 and 5w40?

Thank you. Manual literally just says API SL (ILSAC GF-III) SAE 5W-30 SAE 10W-30 HOT ENV but upon looking at english manual it gives different info, now it says Gasoline 1 year / 15,000 km ACEA A3/B3 or A3/B4 or API SM, Up to -25 °C and below: 0W-X, X=30 or 40 Up to -25 °C: 5W-X, X=30 or 40...

Hi TijY :) Can't find it sadly.. Maybe 5W40 I think I can find A3/B4 but I'm thinking to put 5W30 in it.. Or should I go with 5W40? How do I decide? Pass on maxlife / high mileage since I don't burn oil, yeah? I compared on https://online.lubrizol.com/relperftool/pc.html C3 vs A3/B4 and I see...

The only one that I can be sure is trusty in that spec is Valvoline Maxlife. Maxlife I got told to not use if I'm not burning oil. The alternatives that I can trust and find are C3 and A5/B5. I'm guessing C3 is fine, but interval of change needs to be shorter. Edit: Just checked, sulphur ppm...

Hi folks. Hope everyone is doing good. I have a Chevrolet (Daewoo rebrand) Lacetti 1.4L engine (F14D3 L95), same in Kalos, Aveo, Nubira models - E-TEC II DOHC. Naturally aspirated, port side injection. It was already engine swapped once, since the valve belt broke and pistons destroyed all...