Cheers. Well, diesel related but specific to LandCruiser 70. Factory filtration does not do enough for the commonrail fuel system as such why they are always having issues. Extreme tolerances and pressures demans super clean fuel and and such, Australia has some of the worst fuel compared to USA and Europe. Very dirty and unrefined. Whenever moisture is present in a commonrail diesel system, is causes express friction and thus premature wear. So fitting a proper separator filtration unit will take out the bulk of the impurites while leaving the factory filter able to do its job better without getting loaded as quickly.
During the last 10,000klms, impurities breached the filter element due to bad fuel as I was travelling interstate and at a different gas station every fill. I have never had such bad results over a small 10,000klm period and Toyota does not periodically change the fuel during routine maintenance at all. They change the filter when the dash warning light becomes present. But by then the engine has injested gallons of dirty fuel. I am sure servicing and standards are different in the US.
For myself, as my vehicle is new, I want to get something sorted as soon as possible. I have 2 products at present. 1st being Fuel Manager FM100 and the 2nd being a Baldwin FFK 1259 unit that Cummins use.