2008 WRX... unknown service history

[grjr]

2008 WRX ~139,000 miles turbocharged 2.5 L H4 (EJ255 I believe). Unknown service history, probably ok to say it has been neglected. Just performed an oil change on it with a little less than 5 Qt of Kirkland 5W-30 synthetic and a WIX 57712XP. Previous oil change was done by myself, probably with Pennzoil Platinum and the same 57712XP filter a few years ago and around 11,500 miles ago. ~3 months ago engine was run low on oil and ~2.5 Qt was added to get it ~0.5 Qt past the full mark.

Pulled plugs 1 and 3 on the passenger side to check them out and look down the cylinders. They look to be the correct NGK plugs for this vehicle but are quite a bit crustier than I am used to seeing. Any guesses as to how many miles they've been used? I'm guessing it's probably a good time to change them or are they still good to go? Gaps measured ok.

This is not my car, just do work on it sometimes when things break.

 

[cptbarkey]

Yours look mostly normal https://www.championautoparts.com/P...-and-maintenance/how-to-read-spark-plugs.html

If you have no service history:
Replace the timing belt and water pump with quality Aisin parts.
Fix all oil leaks, you probably have a few.
Replace the radiator, thermostat and hoses, they are end of life.
Inspect the suspension, do the necessary tasks.

Nice car, you are lucky to see one that runs at that mileage. Have a good time.

 

[SubieRubyRoo]

I’d ditch the WIX XP faster than trying to mule some coke past a TSA dog. They’re built well but are rock catchers at best. Even the NAPA 7712, teacup that it is, would be preferable IMO, but the 7055 and 3593A filters fit as well and are perfect for 5k OCI.

I’d personally never use Kirkland in a boosted EJ, but that’s me; M1 FS 0w40 would be my shelf pick.

Plugs are fine but definitely have some mileage; my 3.5EB plugs at 75k didn’t have that rusty appearance. Check out the coolant mod for cylinder 4; this should help prevent the hot spot and accompanying doom that can happen on the EJ255 and EJ257 when pushed really hard.

Like Barkey said, talk them into a good timing belt & water pump kit, new thermostat & hoses, and flush the rad really well. New radiator cap and make sure it’s at least 1.3 bar if not the STI higher pressure cap.

Push them to stick to 5k; EJs can certainly be reliable enough (mine is going to pass 200k this week on original ‘07 head gaskets) but they require a little more frequent attention.

You should do a turkey baster D&F on the power steering with MaxLife ATF as well, since you’re a nice guy and all to whoever owns this car.