Jim has made a very valid point. The oil filter would be in by-pass at start up without a doubt,which sends unfiltered oil through the engine until the oil is hot enough and thin enough to be filtered.
Now if one could find a filter with a higher by-pass psi to run in this situation then that would lessen or stop the by-pass event from taking place.
We all know that even a 0w is too thick at start up,and a by-pass event can take place with oem rated filters if rpm are even slightly elevated,until the oil is up to operating temp.
This is why diesel filters tend to have higher psi by-pass ratings. They tend to require 10w and 15w oils specified from the oem and when cold these oils are hard to pump,so the by-pass is built for more psi to insure the oil passes through the filter.
Yes I'm sure the engine is running fine with a straight 40 grade oil and honestly if the engine ran continuous without shutting off its likely ideal however its far from optimal and I expect that there is much more start up wear occurring which may affect the longevity of the engine as a whole.
I think the rings are experiencing more wear simply because there would be absolutely no oil splashing on the cylinder walls for at least 90-120 seconds,until the oil is thin enough to splash up there.
Other than the rings the rest of the engine likely has enough of a film to not experience too much extra wear,but don't fool yourself there will be elevated wear.
Now if one could find a filter with a higher by-pass psi to run in this situation then that would lessen or stop the by-pass event from taking place.
We all know that even a 0w is too thick at start up,and a by-pass event can take place with oem rated filters if rpm are even slightly elevated,until the oil is up to operating temp.
This is why diesel filters tend to have higher psi by-pass ratings. They tend to require 10w and 15w oils specified from the oem and when cold these oils are hard to pump,so the by-pass is built for more psi to insure the oil passes through the filter.
Yes I'm sure the engine is running fine with a straight 40 grade oil and honestly if the engine ran continuous without shutting off its likely ideal however its far from optimal and I expect that there is much more start up wear occurring which may affect the longevity of the engine as a whole.
I think the rings are experiencing more wear simply because there would be absolutely no oil splashing on the cylinder walls for at least 90-120 seconds,until the oil is thin enough to splash up there.
Other than the rings the rest of the engine likely has enough of a film to not experience too much extra wear,but don't fool yourself there will be elevated wear.