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- Jul 2, 2007
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I made a find on another forum that may interest BITOGer's. I cannot find anything about this so far, other than this source. Wife's GMC has the same 15 minute wait time advisory as this F150 topic refers to and later in the thread a user states check valves are now in dipstick channels of most all Auto Start/Stop vehicles. I can't verify the truth of that but it is certainly interesting.
Apparently the reason some vehicles with the new Auto Start/Stop technology say in their manuals to let the car sit at least 15 minutes to get an accurate dipstick reading is because Auto Start/Stop oil pan setup for the dipstick is different and will feature a Check Valve between the dipstick and the oil in sump. This valve apparently prevents oil from traveling up the dipstick tube during an Auto Start/Stop re-start.
Here is the post with a helpful diagram. Unknown origin of the diagram.
https://www.f150forum.com/f118/mityvac-oil-suction-machines-456226/#post6324663
This means the suction tube from an OIL EXTRACTOR while it may slip past the tail section of the check valve, it cannot directly enter the sump to remove the oil. Diagram in the linked post demonstrates this.
Apparently the reason some vehicles with the new Auto Start/Stop technology say in their manuals to let the car sit at least 15 minutes to get an accurate dipstick reading is because Auto Start/Stop oil pan setup for the dipstick is different and will feature a Check Valve between the dipstick and the oil in sump. This valve apparently prevents oil from traveling up the dipstick tube during an Auto Start/Stop re-start.
Here is the post with a helpful diagram. Unknown origin of the diagram.
https://www.f150forum.com/f118/mityvac-oil-suction-machines-456226/#post6324663
This means the suction tube from an OIL EXTRACTOR while it may slip past the tail section of the check valve, it cannot directly enter the sump to remove the oil. Diagram in the linked post demonstrates this.