Love this group, learned alot lately but the threads on Toyota V6 sludge monsters had me worried. Yes I know the 95 engines don't fall under the label as sludge producers but I had to check and wondered how much they actually changed the engine in 97. The car has run Mobil one 5W30 since 3000 miles and now has 110,000 miles. I changed the oil and filter every 3-5000 miles. Opened the valve cover and saw absolutely no sludge and no varnish! I was a little surprised how clean it was! Buttoned it back up and was very happy. Nice engine in this car, runs perfectly smooth and pretty fast! If anyone wants to host a picture or two of the inside of this engine, let me know, I took a couple of digitals.