Thread: Why check oil level when hot?
05-05-2013, 03:55 PM #1
Why check oil level when hot?
Hi, probably a stupid question but here goes
Why does the oil level (2008 RXT X) need checking when then the engine has been run up to normal operating temp as advised per the operating instructions?
Surely if the hull is levelled ergo motor is level and left overnight then almost all of the oil will gravitate into the sump and give me a true level in the morning whilst cold and before start up?
I am making an assumption that it is a wet sump and not a dry sump - am I wrong in thinking that (cant see an oil tank anywhere)?
Surely its far safer to ascertain the correct oil level before starting the engine and using it until it reaches the correct temp?
Thanks for your thoughts
05-05-2013, 07:22 PM #2
I asked this question once as was told "because the oil, when heated to operating temps, will expand in volume slightly, which will result in a true read...". I'm thinking it doesn't make that big of a difference for a stocker like myself operating between the bends on the stick, but if you're trying to squeeze every single unit of HP out of the 4Tec, then maybe so...
05-05-2013, 07:44 PM #3
- Join Date
- Feb 2013
- Ontario, Canada
if my oil level is at the top off the bend and I wanted to bring it down to just over midway how much oil should I take out(when cold)
05-05-2013, 08:30 PM #4
I would pull out no more than 4 ounces and re check.
05-06-2013, 12:39 AM #5
For me its easier and I think safer to check when cold before starting. I will just make sure the level when cold is just below half way point so as to allow any slight variations due to thermal expansion if any.
Thanks for your help
05-06-2013, 05:00 PM #6
- Join Date
- Sep 2009
The other thing to remember is that these engines are dry sump, with multiple chambers. Takes awhile to get things evened out. The crank "dry" sumps are actually blowby scavenged.
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