2009 Smart ForTwo, Castrol Edge 0W-40

[mattwithcats]

2009 Smart Car, Castrol Edge 0W-40, with NAPA Platinum Filter...

I did not know if this was the old formula Edge with or without titanium, looks like without.

 

[Quattro Pete]

How many miles on the oil?

 

[mattwithcats]

About 5K, all short trips...

 

[mattwithcats]

This fill was Castrol Edge 0W-40, without titanium (old bottle)
Ran really well until the end, transmission started to hunt, power (from a 999 cc 3 cylinder) was missing.
Temp was really stable, 185 plus or minus 2. 183 to 187...
Oversized filter, Fram 7317 equivalent (NAPA Platinum 41356)

Current fill is Pennzoil Euro 0W-40, really smooth, temp is fluctuating a little more, plus or minus 8, 177 to 193...

 

[Quattro Pete]

The oil is down to a 30 grade, but I dont see any issues really.

Originally Posted By: mattwithcats
transmission started to hunt,

Why would engine oil affect performance of the trans?

 

[Greasymechtech]

Change the transmission fluid.

Why use such a thick motor oil?

I understand the 10k MB 0w40 requirement. If changing oil at 5k, skip 0w40 long life oils and use a synth 0w30 or 5w30.

Being a Mitsubishi engine, I'd wager it run pretty well on a 0w20 oil too.

https://bevo.mercedes-benz.com/bevolisten/229.5_en.html

 

[aquariuscsm]

https://mobiloil.com/en/product-selector?Year=2009&Make=U21hcnQ%3D&Model=Rm9ydHdv&Engine=UHVyZSAzLUN5bCAxLjAgKDEzMi45MTApIChHQVMp

Looks like your car is spec'd from a 0W30 up to a 5W50 (with 0W40 being the highlighted recommendation according to Mobil). I'd meet it in the middle (like I do for my car) and stick with a 40 wt. Your uoa looks great! I'd keep on doing exactly what you're doing.