5w-20 motor oil : who's using it ? ...

[1stToyota]

Originally Posted by TheSilkySmooth

Silverglow is a troll and should be ignored like most ignoramuses causing trouble and being of no benefit to the forum.

I think his advice on oil is bad. He throws "UOA" around a lot, maybe thinking it'll impress, but goes on to hand out advice about which oil to use, claiming that if 5w-20 is approved for use in our 1.5L, then "UOAs" will show that 0w-20 will work even better in our cars. Most people probably know better than to use a viscosity that isn't listed in the owner's manual or in the latest TSB, but SilverGlow doesn't seem to understand it yet.

[TheSilkySmooth]

Originally Posted by 1stToyota

I think his advice on oil is bad. He throws "UOA" around a lot, maybe thinking it'll impress, but goes on to hand out advice about which oil to use, claiming that if 5w-20 is approved for use in our 1.5L, then "UOAs" will show that 0w-20 will work even better in our cars. Most people probably know better than to use a viscosity that isn't listed in the owner's manual or in the latest TSB, but SilverGlow doesn't seem to understand it yet.

I agree, re: UOA are not everything. You can still have a massive failure due to inadequate viscosity which would NOT show up on a uoa until the rod is snapped in half or the had bearing seized and spun. And any mechanical engineer or engine machinist worth their salt will tell you noise = wear all else being equal (diesel are another matter). Also engine are designed to retard timing in the presence engine noise over a specific threshold. So thence goes the fuel milage with the water weight oils. I have dsriven fords designed to run on 20W oil and they run fine. I have never seen and engin that will run on a 20W or 30W. The piston to wallclearances are incompatible given most new engines employ slipper-skirt short pistons.