Will these wheels fit a 2008 Mitsubishi Outlander XLS V6?
https://www.evasivemotorsports.com/store/product/enkei-gtc02-wheel-18x8-5x1143-offset-45-hyper-silver/

 

Our offset is 38mm...that one has 45mm

 

Does the offset mean the wheel will stick out further? Or the 45 will not fit at all? Can a 40 offset work?

 

Looks like it would suck the wheel more into the vehicle.

https://m.tirerack.com/tires/tiretec...RoCK4kQAvD_BwE

 

If you now have more than 20mm / 0.78" clearance towards the suspension (which you probably have), then the new size will fit. At least, mathematically...

Positive offset means how many millimeters away is the fixing plate of the wheel from the wheel's center line towards the outside (road side)

If you have the stock wheels, those are 7" wide = 177.8mm. Half of that is 88.9 + the actual 38mm offset = 126.9mm from the fixing plate to the inner edge.
The new wheels are 8"wide = 203.2mm. Half of that is 101.6mm + 45mm offset = 146.6mm from the fixing plate to the inner edge.
So the inner edge of the new wheel will be closer to the suspension with 19.7mm / 0.78". (146.6-126.9)
And the outer edge of the new wheel stick out 5.7mm more than the actual one.

But this is for the rims.
I assume you also want wider tires. The closest match considering the circumference is 245/50/18, or, if you want a bit higher ride 235/55/18.

Anyway.. keep in mind that the largest stock wheels (optional but still OE) for the 2007-2012 Outlander are the 245/45/19 on 8Jx19 ET35 rims. These are 10mm fuhrer away from the suspension compared to your option.

 

Would this size wheel fit 18x8.5 / 5x114.3 / Offset +35

 

It seems better balanced compared to the previous one.
Here's a calculator with a graphical overlay of the two options.
What tires do you want to mount on 8.5" wide rims?

 

235/55-18