Nope, you don't need to change all four. I had a similar problem on my Subaru Legacy years ago, and I simply bought one new tire and then took it to a local race shop and had them shave the new tire to the same depths of the old one.
Just finally did my yearly oil change on my old faithful 04 wrx 177k miles last week. Put 14,370 miles on the signature series 0w40. Oil sample got in today. 31% oil life. Very little brass, relative clean oil. Waiting for my rod bearings to die but if this keeps up they might last a bit longer! Keep in mind I was using amsoils 25k mile oil filter aswell.
I just had to replace the windshield in my STI today actually. The installer used a windshield from Pilkington who is also the OE supplier for Subaru. The Pilkington windshield has the exact same sun deflector dot pattern at the top, between the rear view mirror and the roof and has the integrated heater lines for the wiper defroster. The only difference is that the replacement has the Pilkington logo instead of the Subaru logo.
Change the stock tires. Trust me. Noise difference is night and day. I have no idea what Subaru was thinking with those particular Yokos. I mean, just read the reviews:
http://www.tirerack.com/tires/tires.jsp?tireMake=Yokohama&tireModel=AVID+S34D
I changed mine to some new high quality Pirelli's not even 1k miles after I got the car and holy cow what a difference in traction/stopping-power and noise. Had to do so out of my own pocket since the dealer didn't get convinced by my explanation of the poor tire choice Subaru made. Anyhow it was worth it, I feel a lot safer on the road now and every bump is smoothed out very pleasantly.
On my '04 WRX I used the Depo replacements after I tried the E-Bay Halo replacements for 1 day (worse headlight ever on the cheapy cool looking things). The Depo were OEM "look", probably insurance approved. I know they are not OEM, but I would say they are +95% of the OEM light pattern, which is still VERY good.
Koyo is what I'm using. Quality stuff. I'd highly recommend.
mishimoto makes a great aluminum replacement at a decent cost.
I wasn't thrilled to see the OEM tire choice is yet again the marginal Bridgestone RE92, but they seem to do the job without being noisy. I have a feeling a set of dry-pavement UHP tires (RE730, S-03, etc) would make a good thing even better.
I have a 2019 with 40000km and the windshield just cracked for the second time this week. Wasn't even a big chip that caused it.
I own a 2017 Forester. I’ve had to have the windshield replaced twice due to it cracking all by itself. The NHTSA reports are absolutely true. The second time it sat at the dealer for over 4 months because they were on back order. This is all due to Subaru using thin lightweight glass to increase fuel economy for CAFE numbers.
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