Wrong. Changing viscosity effects fuel consumption.
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Really? I've read otherwise from many sources, and it seems logical that thicker oil will result in worse fuel economy. For instance, if I run a thick oil in my GSi like a 20W50. It would affect fuel economy, because the oil pump has to work harder to circulate the thicker oil. I'm not saying thicker oil is bad, this is just an example.
Perhaps with my scenario from 10W40 to 10W30, might not make a noticeable difference. But I'll never know until I try.
As for the effect on warming up the engine quicker, not 100% sure about this. But I definitely agree with you on using synthetic on older engines not being a huge deal.
Burning/losing oil isn't a bad thing.
Excessive losing/burning oil is.....
i personally run a 15w-40 semi synthetic in my b18c and the reason is simple;
thats what that my engine needs.
try a 10w-30 then if its going through a fair bit of it swap it out to something a bit thicker, pretty straight forward.
What oil is so superior?
How much exactly does a good or bad oil effect consumption?
If you think it makes a difference then it must be a real poofteenth and certainly not a genuine selling point for any oil.
I've used FEO, Magnatec 10W-40 semi, Nulon 10W-40 synth (just remembered actually) and currently using Penrite 10W-50 synth with zinc. My fuel economy with the Penrite is currently the best it's ever been since I bought the car in early 2008. So that's five and a half years, and I always drive until my tank light comes on, fill up at the same BP, and calculate my economy per tank.
This is why I went 10W-50, and IMO it's the only good reason to change viscosity. I'm burning about 700-800ml less oil each 5,000KM. Engine is getting on a bit obviously.