ammcinnis

Exactly! That's what I did when I installed a Fumoto drain valve on my 2015 Legacy 2.5 (FB25 engine), and the threads on the valve (w/gasket in place) were so close to precisely the depth of threads in the oil pan boss that it wasn't worth making any modifications. In my case it was truly Plug-and-Play. Not a good idea, IMO. That's an 80% overtorque. But done is done, so at this point I would just leave it.

Good advice. Monitoring oil consumption is one place where the long-term trend is usually more important than any single data point.

You also need to read both sides of the dipstick. The two sides will likely indicate slightly different levels, and the lower is the one to use (per Subaru). I presume that this discrepancy is due to the dipstick entering the oil sump at a very shallow angle. This is also why you should check oil level while parked on a dead-level surface.

1) The stiffer the anti-roll bar, the less "independent" the suspension becomes. 2) Some degree of understeer (a.k.a. "push") is desirable in a street suspension system under all conditions, both for straight-line stability and near cornering limits. There is quite a bit of understeer designed into the stock Subaru suspension, and a stiffer rear anti-roll bar will reduce that understeer somewhat; the result is slightly more neutral steering response. 3) Subaru uses the same 16 mm rear anti-roll bar on both the Legacy and the Outback, despite the Outback's higher center of gravity. If anything, the Outback's handling on pavement should benefit more from a stiffer rear bar than the Legacy, but the stiffer rear bar may actually hurt suspension performance off-road. See 1) above.

Engine: 2.5 H4 (FB25) Odometer: 5,186 miles (first oil change @ 6 months) Oil added: 0 Driving style: easy to moderate Estimated % highway: 40% Estimate average speed: 36 mph Full engine operating temp: usually Lifetime mpg: 29.5 (30.7 per on-board EcoMonitor) Observed oil consumption in first 5,186 miles: less than 1 pint.

But you do have the Tomb of the Unknown Tourist, don't you?

Those are the correct numbers. The torsional stiffness of a solid rod is proportional to the 4th power of the diameter. 16mm stock = 1.00 (19/16) ^ 4 = 1.99 (20/16) ^ 4 = 2.44 (22/16) ^ 4 = 3.57 N.B. For a stabilizer bar, you also have to consider the length of the arms at each end. I know the arm lengths are the same for the 16mm and 19mm Subaru bars, and I assume that arms on the 20mm bar are also the same length. I think the aftermarket 22mm bars have variable arm length (e.g. multiple attach holes), so that would affect the overall stiffness of the bar installation.

Your original assertion was "all dual exhausts" ... not limited to street-driven Subaru Legacys.

I dispute your assertion of "all." For ordinary street use, maybe. Otherwise, I suggest you try to locate, read, and understand a copy of P.H. Smith's classic Scientific Design of Intake and Exhaust Systems. Or you could look at just about any multi-cylinder motorcycle ever made. I do agree that there's no technical advantage to an X-into-2-into-1-into-2 arrangement.

A 19mm bar will be twice as stiff in torsion (99% stiffer, actually) than the OEM 16mm bar. I'm not agreeing or disagreeing with the anecdotal claims made here and elsewhere, just making the point that a "small" 3mm increase can have a significant effect. FWIW, a 20mm bar is 144% stiffer than the OEM 16mm bar (i.e. 2.44 times as stiff), which is why I recommend against it as a first step. If someone wants to experiment, I suggest they try the 19mm bar first and go from there. Bigger is not always better.

I agree with you, but there is no shortage of anecdotal claims to the contrary. Rear stabilizer bar (i.e. anti-roll bar) stiffness can affect straight-line handling by changing the suspension's response to road surface irregularities ... e.g. a stiffer bar will increase bump/roll coupling.

I doubt it. You can't re-use the original 16mm bushings with a 19mm bar. Think about it: old bar = 16mm, new bar = 19mm. You can re-use the steel mounting clamps, though.

Yep. Probably even further complicated by SRF if EyeSight is present.

Installation Instructions: 2015 Legacy Fog Light Kit (6/12/2014)