07-27-2014, 12:07 PM
(11-22-2013, 02:10 PM)Deanohh_imp Wrote: All the oil passes through the oil cooler all the time. Oil doesn't drain out of the oil cooler when drained from the engine and its not supposed to. If you had to wait after the oil change for the cooler to fill up with oil the engine would be starved for oil while the cooler was being refilled by the oil pump.
The oil cooler is a critical component in the cooling of the engine. Oil has to circulate freely to carry heat out of the engine and into the oil cooler and bring the cooled oil back to the engine. If you put a bunch of thick slow moving oil in the system then it is not going to circulate as good and not cool as good as a thinner oil. You fill it with a heavy 10w40 or 20w50 and it will be worse for its ability to help the engine run cooler. I'll stick with the 10w30.
Being thinner and slipperier ( if it is), a synthetic 10w30 would be even better for helping to cool the engine because of its better circulation to dissipate heat, and still have excellent lubrication.
If you mixed 5 qts of 10w40 with half a quart of 10w30, would you end up with 5.5 quarts of 10w38?
There are two oil pumps and two separate circuits. You wouldn't starve the bearing IF it drained out of the cooler.