I thought that the 405 hp motors got exh & Int valve stem oil seals? I'm almost positive the 375 hp motors are missing one or both, I think it's only the exh seal they left out?
Anyway, GOFAST how are your PCV valves? I change mine every year as part of my "get ready" for the season. I have noticed that they don't make that clear metallic clinking sound after a season's worth of use, for me somewhere between 6k to 8k miles. As I get towards season's end my oil use goes up or becomes accelerated if you'll allow me that phrase. I can't find the oil on the plugs. Anyway, my point is my LT5's use seems directly related to the health of the PCV valves...or at least that's JMHO thru my own observation. Oh yea, pounding on Her just seems to speed up oil loss no matter when I do it. One of the development issues LOTUS had, ccv blow by ( my words, not LOTUS ), as there is no place for the internal wind with oil in it to slow down enough for the oil to coalesce and fall out of the air stream. Or at least that's what I think they, LOTUS, was saying. I would think that if that is true, then how clean the PCV valves remain over their time in service would be very important to oil loss?
As for checking the oil level. I use my car only on weekends and that's when I check my oil as part of my pre-start up check list. I always get consistent readings from the dipstick. If you think about all the places in our heads that oil can hide I can easily see 4 or 5 hrs should pass before all the oil gets back to the pan. Okay maybe a bit less?
These are just my observations with how my engine behaves in this regard.
Tom