I was talking about the add-on oil filters I've seen on several Tundras. We have purchased some year old Tundras that have a lot of life left in them. One of these also had a great big oil cooler and remote dual full flow filter setup, all with braded lines and AN fittings. It was a very professional installation. So we moved this truck into our sever service group. They all get mods to help them last a bit longer, life beefed up shocks and shock mounts, plates for approach and departure protection, big skid plates to protect all the goodies and beefed up trailer hitch. The engine needs nothing except a prefilter for the air filter and sometimes a snorkel. We also have modified the fuel injection on some models that idle a lot. It picks up the idle just a bit and if the engine gets hot, it picks it up some more. The mods were easy to do and can be changed with a laptop computer.