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10W40 is standard. 5W40 is o.k. too. You can change the type but mixing different types is forbidden for some reason.
One figure is for fluidity and the other one for temperature rating in extreme conditions. Ask a mechanic.
Not likely. 20W-50 is usually used in high rpm engines in warm to hot climate. By any chance is your windshield defroster on? When the defroster is blowing your air conditioner compressor is engaged which pulls the moisture out of the air so you get HOT DRY air blowing on the interior of your windshield
FLORIDA , ME 2 .. I USE A HEAVY OIL IN ALL MY STUFF TILL THE TEMP GOES DOWN OUTSIDE .. I ALWAYS USED CASTOL 20/50 IN MY BIKES OR MOBILE ONE IN MY VETTE 15/50 ..IF'N I WAS ANY HELP AT ALL PLEASE VOTE.. JAY
VERY POSSIBLE THAT IT IS ONE OF THE TURBOS THAT IS GOING OUT. WILL HAPPEN IF POOR OIL SERVICE. ALSO CHANGE YOUR OIL WITH A SLIGHTLY THICKER OIL IF OVER 80,000. I OWN A 01 2.7T WITH 89,000 AND USE ROYAL PURPLE SYNTHETIC 20W-50
I ask that same question about my 2007 and was told that the main reason for the lite oil weight was to give better gas mileage. Still though I never changed because I got over tinkering with the manufactures specs. in my hot rod days. Stay with the 5-20W.