"I was doing an oil change on my car the other day. I had a friend of mine pick up the oil for me (he works for auto-zone and got me the royal purple half price) Anyway by the time we were all finished. i noticed it was 5w20 not 5w30. i was wondering if this could cause some problems or anything? Any help in this mater would be much appreciated. oh by the way i have 1998 c5 a4"
I would not worry about it for a second!, you've used a good quality synthetic, its going to provide the necessary lubrication,
but if your concerned , drain a qt, then throw in a qt of 20w50 and your golden,but in my opinion, its a waste of time and effort, but if its a concern, go for it!
you generally want to have about a 15psi-25 psi oil pressure at idle and see a steady increase in pressure as the rpms increase, if the oils too thin add a bit thicker oil like a quart of 20w50 to that thinner oil,
personally ID just remember to check my oil level at each gas tank fill up and add that qt of 20w50 oil if it got too,a 1/2 qt low.
if your concerned add about 4 oz of marvel mystery oil rto each tank full of fuel to aid the upper cylinder lubrication (A GOOD IDEA AT ALL TIMES IN MY OPINION ANYWAY)
think it thru ..Hydrodynamics pressure is resistance to flow
so higher viscosity more resistance = higher pressure
if the oil pressure changed and nothing but the filter used was different then the filter with the higher pressure is restricting oil flow, it sure can,t be the bearing clearances, oil pump, etc, those remained constant/un-changed
It could easily be that your dealing with far less total surface area on the fram filter, which could easily be what reduces flow rates, and increases pressure.
it could be that fram filters medium has finer filter medium,that clogs faster, and in theory catches finer size crud, but most filters are designed to capture a fairly standard size range of contaminants
if the filter elements IDENTICAL and the FRAM has 200 inches of filter medium vs lets say 350 for a pureolator filter there should be a reduced restriction to flow of about 57% with the larger surface area with identical filtration, well that is of course with brand mew filters, obviously the smaller filter area will clog much faster as it gets filled with crud in the pores of the filter medium.
but keep in mind the surface area of the filters, and physical construction vary by brand and part number and so does the materials and drain back valve construction.
related info you really should read thru
viewtopic.php?f=54&t=117
viewtopic.php?f=54&t=2187
viewtopic.php?f=54&t=3536
viewtopic.php?f=54&t=3834
http://www.castrol.com/castrol/generica ... Id=7007302
viewtopic.php?f=54&t=1334
I would not worry about it for a second!, you've used a good quality synthetic, its going to provide the necessary lubrication,
but if your concerned , drain a qt, then throw in a qt of 20w50 and your golden,but in my opinion, its a waste of time and effort, but if its a concern, go for it!
you generally want to have about a 15psi-25 psi oil pressure at idle and see a steady increase in pressure as the rpms increase, if the oils too thin add a bit thicker oil like a quart of 20w50 to that thinner oil,
personally ID just remember to check my oil level at each gas tank fill up and add that qt of 20w50 oil if it got too,a 1/2 qt low.
if your concerned add about 4 oz of marvel mystery oil rto each tank full of fuel to aid the upper cylinder lubrication (A GOOD IDEA AT ALL TIMES IN MY OPINION ANYWAY)
think it thru ..Hydrodynamics pressure is resistance to flow
so higher viscosity more resistance = higher pressure
if the oil pressure changed and nothing but the filter used was different then the filter with the higher pressure is restricting oil flow, it sure can,t be the bearing clearances, oil pump, etc, those remained constant/un-changed
It could easily be that your dealing with far less total surface area on the fram filter, which could easily be what reduces flow rates, and increases pressure.
it could be that fram filters medium has finer filter medium,that clogs faster, and in theory catches finer size crud, but most filters are designed to capture a fairly standard size range of contaminants
if the filter elements IDENTICAL and the FRAM has 200 inches of filter medium vs lets say 350 for a pureolator filter there should be a reduced restriction to flow of about 57% with the larger surface area with identical filtration, well that is of course with brand mew filters, obviously the smaller filter area will clog much faster as it gets filled with crud in the pores of the filter medium.
but keep in mind the surface area of the filters, and physical construction vary by brand and part number and so does the materials and drain back valve construction.
related info you really should read thru
viewtopic.php?f=54&t=117
viewtopic.php?f=54&t=2187
viewtopic.php?f=54&t=3536
viewtopic.php?f=54&t=3834
http://www.castrol.com/castrol/generica ... Id=7007302
viewtopic.php?f=54&t=1334