Most diesel engined cars in Malaysia would not have a DPF installed and should run engine oils that have ACEA B4. ACEA B4 means that the oil is not compatible with diesel engines equipped with DPF.

Therefore the conclusion is ACEA C3 is for diesel engines with DPF (highly unlikely in Malaysia). ACEA B4 for diesel engines without DPF.

From what I know, putting ACEA C3 type of engine oil in a diesel engined car that does not have a DPF can be detrimental. The same goes if putting a ACEA B4 type of engine oil in a diesel engined car that is equipped with a DPF.

Reading the specs for 4100 and 4200 seems a little confusing because it claims both oils can be put into DPF and non DPF equipped diesel cars.

Problem is you can also use the 4200 since it also states LL04.

Anyway, your E90 is not with a DPF, correct?

Any reason why a Swift requires so heavy engine oil?

Kinda hard to pinpoint which is the best but for my pocket, I use 5W30 fully synthetic from Mobil 1 for Mazda6 2.5L (for 6 years) as well as Mazda5 2.0L (for 5 years). Fully satisfied with it.

LOL Took a 2nd look and he mentioned "increase fuel consumption".

Why would anyone do that? Surely that's a typo right?