Agree : if cylinder head & piston rings have the same co efficient of expansion*, * will be the same, designers make sure of this.
| > wear will increase Only if plain mineral oil ( coarse, obsolete, too thick when cold, become tar by 121ºC ) is used.
| > unburned gas that slips by the rings and dilutes the oil in the | > crankcase. Only before PCV was invented,
No, if the engine runs too cool because of missing thermostat, increased wear will still occur due to fuel dilution of oil because the engine's controls will be stuck in warm up mode.
nate
| wear will still occur due to fuel dilution of oil Impossible, petrol is very evaporative, in summer oil will be hot enough to evaporate off petrol, pcv will suck petrol fume into air intake
| engine's controls will be stuck in warm up mode Temperature sensor cannot work ?.Then what's it for ?
The temperature sensor will still be working "correctly" just telling the computer that the engine isn't fully warmed up yet.
nate
Gasoline is not a single hydrocarbon. It has a number of constituents of varying vapor pressure. Some components do evaporate readily, but the heavier components of the cut do not. Nor do some of the additives (gasoline these days is not just gasoline). What remains may not be the best lubricant.
Plus, there's more of it being injected in warm up mode- same as leaving the choke on on a carb'd vehicle.
nate
| What remains may not be the best lubricant.
~8x I've used a white funnel* to pour BP petrol, & left * to dry : when dry, no residue could be seen / felt
And what about water blow-by condensing in the crankcase? Nobody has mentioned sludge.
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