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Yes.

Welcome, any 80w GL4 will work, Castrol is perfect or Ravenol.

It means what I said. GL4 is hypoid oil too.

RIP

Yes, GL4 too depend on working conditions and manual advise.

Castrol VOA Yes they are mostly the same Motorcraft XT-M5-QS, Ford BO, Castrol BOT 328/130M

Go with GL4. Castrol Syntrans Multivehicle 75w90 is the best option price/quality. True GL4, true synthetic and plenty of esters.

Any similar GL4 ZDDP options: - RedLine MT-LV 70/75w - Ford 75w FE D2 / Volvo 31280771 / Castrol BOT 303 PAO and 350 semi-PAO - Toyota LV 75w - Honda MTF-3 Ultra

Ravenol should be real data. You find more info from independent laboratory test aka VOA.

Hi, welcome First you should know datasheet is not fully true, it's generic or min spec sometimes, SHU 5w40 pour point is around -52ºC SN and -57ºC SP.

75w80 GL5 comes from original spec Subaru Extra MT. Manual and other sites offers 75w90 GL5 as alternative.

If you prefer 5w40 over 5w30 you can use it. Said that, some 5w40 are nothing special and some 5w30 are better quality and performance, so you could see even worse results with 5w40. 0,5 to 0,3 oil consumption /10k km with hard driving shows really good condition and oil work, I wouldn't change...

Yes specially top 4.

Haldex oil is 75w with same ZDDP package like other MTF and engine oils, but highly additived, GL4'ish. These are some similar: - RedLine MT-LV 70/75w - Toyota LV 75w - Elf NFX 75w - Ford 75w D2 - Honda MTF-3 Ultra - Castrol BOT 303 Some syncromesh could be ok too, but additive a few more weak...

0w40: Castrol, Eni I-Sint, Elf/Total, Motul, Petronas or even Mobil1 ESP X3/X4 0w40+: Red Line, Amsoil, Ravenol, Meguin Megol 5w40+: Red Line, Amsoil, Ravenol, Meguin Megol

Wait 1.000 miles, it's going to work little better, ask to daughter in next weeks.

Unmarked crosswalk is unacceptable. Pedestrian can not cross the street as they want, rules are for all, drivers and pedestrians.

Original spec for 2016 MT-6 is 75w90 GL4. If you buyed Ford/Motorcraft 75w90 GL4 go with it, famous in Mazda for years MT-5 and 6. It's TOP classic GL4 true syn + esters, works really good when cold and when warm it's like 75w85'ish. If it doesn't help go with 75w GL4 like Ford WSS-M2C200-D2...

If engine accepts 229.5 yes, it's possible, not big problem but they changes a little chemical properties. I'm not big fan of "homemade oil blend".

Yes, you can feel it's good. Yes, it's safe regular GL4, RedLine it's more than regular GL4, strong TOP formulation really. About oil brands webs and assistans, the advices are generic like "not use GL4 for hypoid" because API says other thing. Enjoy your good decision, money well spent.