Originally Posted By: JRed
uart:
My oil was molasses colored at 15,000 miles.
Hopefully only in color and not in viscosity.
Yes my oil gradually darkens over the OCI, but the viscosity and feel of the oil is pretty much the same when I drain it as it was when I put it in.
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Is the 55 MPG measured in imperial gallons? If not, I commend you for having a very light foot. Is your Prius a second or third generation?
Just a secondhand 2005 gen2, had it about 3.5 years now. Yes that was converted to US MPG, we use L/100km here. Typically I get 4.3 L/100km or better. The longish trips definitely help, as do the moderate speeds and lack of any really cold weather here.
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What oil are you using? I think I'm going to start running Rotella T6 5w-40 (mostly to spite the naysayers, admittedly) during the summer and I don't expect it to effect my fuel economy at all.
I'm only running 5W30, but it's a thicker A3/B4 rated variety of Castrol Edge. Castrols specs are different in different markets, the 5W30 A3/B4 "Edge with Titanium FST" sold here has HTHS=3.6. This is my first run with this oil, previous oil was a thinner Dexos1 GF5 hths 2.9. So I was watching pretty closely for a change in fuel economy and there was none. I've got about 5k miles on it at the moment and been pretty happy with how it's been running. Just coming out of summer here now and I think I'll leave this in over winter and see how it goes.