Quote:
Originally posted by v8Toilet
If the positive crankcase ventilation system wasn't working properly the crankcase pressure would build up and cause oil leaks.
There is no way I would risk running such an expensive engine like the I-force V8 for 25,000 miles on the same six quarts of oil. I'll stick with the 7500 mile interval that Toyota recommends regardless of what the oil manufacturers say. I may be ignorant in saying that but then I don't put the synthetic oil in to get extended oil intervals. I do it for the reasons I stated above.
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This doesn't have anything to do with pressure.....read this then click on the Toyota link below...
Quote from Yotarepair.....
" The actual cause of the problem is an inability of the engine's crankcase ventilation system (PCV) to move the normal gases from the engine. When these gases stay longer in an hot engine it allows deposits to form on the metal parts of the engine. When enough deposits are present "Sludge" is formed. In my opinion the reduced flow of the PCV is related to the vehicle emissions. This presents a problem since to correct it may require Toyota to recertify the engines, come up with a solution acceptable to the EPA and then they still have to repair or assist in repairing the affected engines. The costs would be staggering but ignoring the problem, in so many of their best selling vehicles, may be worse in the long run. In the various articles I've listed below, if you want, you will learn more about the cause an effect.
http://www.yotarepair.com/Sludge_Zone.html
Click on above for more reading....
Alan