Just wondering if it matters if the oil filter is upside down or right side up ?
Just wondering if it would effect cold start up oil pressure?


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Makes a huge difference when you go to change it.  I will never do that again!

I also believe that it helps to bleed air if the fittings are on top.

Lol ok but oil filter upside Down wouldn't cause delayed oil pressure on cold start  up ?


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I think it's best to hit the starter until oil pressure registers on the gauge and then energize the ignition.

Other than that, I don't worry about it.

Mounting the filter horizontally or fittings down prevents you from filling the new filter with oil during an oil change.  I believe that using the pump to fill the filter(s) after an oil change would be more detrimental.