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If you are seeing any sludge there is a problem . Dusty
Well it did sit for 2 years or better with same oil but still wonder about the design of an upside down filter to hold any would be contaminants.
The Colombo designed Ferrari V-12s had 2 upside down filters. Older 911s are horizontal. So, Guzzi is in good company. The most bizarre was JC Whitney in the 60s sold an oil filter kit for VW bugs that consisted of a roll of toilet paper as the filtering medium. It was billed as being easy and cheap to change.😀😀😀
I think putting on the external oil filter system is not the best idea from a maintenance inspection point of view. The sump filter screen needs to be inspected and cleaned. The same with the oil pressure release valve. You can also look up into the cylinders and maybe get a peak on how they are fairing. You can also inspect for partially blocked oil passages god forbid. The oil pans are not the smoothest and have nooks and crannies that allow sludge to develop, you are going to get some using synthetic or Dino oil. You only need to change the filter every third oil change. Now this is something I do. I change my oil when the bike has been setting overnight and is cool, being most of the dirty oil has found its way down to the pan and has not been heated up and recirculated. I do not find much if any sludge when I pull the pan. I am with Dusty, the oil filter will work in any position.
So I imagine you are going to put the oil filter on your car in the oil pan so you can clean the oil pick up screen at every oil change.
There are many vehicles on a road including motorcycles cars trucks boats actually there in the water that have the filters mounted upside down in my case with the Toyota Tacoma truck that I have a version of the engine is the V6 in a 2nd generation and they have been known to go over 300,000 miles with an upside down oil filter change the oil when needed go for a ride and enjoy the bikeTOMB
The oil filter does NOT take all the dirt(carbon) out of your oil. It only takes out the bigger particles, the real fine stuff is in there going around. Oil gets dirty after about 1500mi, I change mine at 2Kmi and filter every 10Kmi. Just cuz you use syn oil means nothing, it's still collecting dirt.
The toilet paper filter is designed to clean the shit out of your oil
I actually enjoy dropping the pan to change oil and filter. It is a very intimate, emotionally bonding experience when done with love and care.
TP, wasn't that what Mercedes used back in the '50s before they figured out how to make $$$ on filters?