quote:The only accurate oil measurement is the one done with the correct viscosity oil under the conditions specified by the manufacturer. Each individual engine/manufacturer uses a specific set of conditions, with an appropriate device calibrated to correctly measure the level under those specific conditions.
Originally posted by Triple_Se7en: The worst oil measurement is right after shutting off the engine. The best measurement is on level ground after the vehicle has sat off overnite.
quote:You can if the tube is being used as a crankcase exhaust, and the OCI has nothing to do with it. You'll routinely find the PCV exhaust lines coated like this even in well-maintained engines. Crankcase gases are a fairly filthy combination of blowby and oil vapors. Before the '60s, this stuff just exhausted out the bottom of the engine and into the next guy's wing vents.
Originally posted by JohnBrowning: You should not have varnish,sludge or rust on a dipstick! If you do then you need to revise your oil change interval.
quote:If you have to ask......... My definition of "varnish" is NOT thick and black. From dictionary.com: "....a hard, glossy, transparent film." Sounds like sludge to me.
Is a thick black varnish on the top 10 inches of the dipstick a bad thing?