Hello all. I have been using various 5w40 oils in an -87 5.0 TPI engine, in the past, but in the past years, since the engine is getting more worn as the mileage increases, total about 100.000-150.000 miles so far, (idk the accurate mileage since the odometer hasn't all the time functioned as it should), the engine has been consuming more oil. Would 5w50 or mixing 5w40 with 10w60 to get a thick side of 5w50, be a good idea? The engine consumes oil about a quart in every six months, its a daily driver so I usually keep adding a tad of oil every few weeks, idk how much oil it consumes at every 1000 miles since the odometer isn't always functioning. The car doesn't see many miles a day, sometimes just few miles a day, sometimes about 20-50 miles a day. The car gets driven in winter, but luckily the coldest that it sometimes gets at winters where I live, is only about 14Fahrenheit. I have nodest that sometimes theres nasty burnt oil smell like burnt BBQ coming from the exhaust pipe, to me its unbearable, so in the past I had to put a catalytic converter back in the car, luckily it helped with the smell, usually it doesn't smell at all, sometimes tho when the car is pushed hard in first gear, but the smell vanishes later on. At this point im not sure if the smell is caused by oil getting burned or if the engine is running rich/lean, and the cat is a temporary fix as it might get clogged over time, since the inside of the exhaust tip gets black of soot even after few miles. The oxygen sensor and the distributor cap, plugs, etc, has been changed according when ever its time for a tune up. My idea so far, when it comes time to change the oil, if I were to use shell helix ultra 5w40 and mix some 10w60, or Castrol edge 5w40 with 10w60. IÂ´ve tried red line in the past, 5w40, and isn't that a thick side, almost 5w50? that didn't help with oil consumption, that's why I have been thinking if some 10w60 would be a good idea. Years ago I tried some STP blue bottle oil additive, it did help with the oil consumption but only for a month or so. The engine does not leak oil. I also change the pcv valve at every oil change to make sure the oil consumption isn't because of bad pcv valve. I usually change the oil and the filter with Purolator filter just before winter and again after winter, around April. I have never used seafoam and never heard of it cuz I have never seen it on shelfs here in Europe but I have always been curious to try seafoaming the engine/intake. The vids on youtube and the white smoke cloud is quite a show! LOL For months now, I've been using Valvoline MaxLife 5w40, and for the heck of it, a while ago added a bottle of Rislone valve seal repair to see if it helps with the blue start up smoke that the car has had ever since I can remember, tho it has indeed for years puffed some blue smoke at start up, even when the engine wasn't consuming oil many years ago, so I assume the start up smoke isn't related to the oil consumption, but its possible that the valve guide seals have worn more as the time has gone by, and these days play a part when it comes to the oil consumption, but for years even these days, it surprisingly does NOT puff blue smoke at start up if the car has been sitting over night, only when the engine is warm and has been sitting for lets say, 10 minutes or few hours. At the time being, I canÂ´t afford to get the valve seals replaced, so any advice about what oil viscosity/additives (if the piston rings are stuck causing extra oil consumption) to use, such as MMO/seafoam/engine flush such as liqui moly or a tad of ATF to use at the next oil change, if it would be a good idea to try, would be appreciated. Thanks.