What would you choose? Such a negligible price difference. Obviously the ultimate protection is a good choice, but my main curiosity is this. Would you rather have quaker state full syn/ultimate protection, or good ol penzoil fully syn? My car is a 1994 ls400 1uzfe non vvti 120k miles. My location is north il. I bought this car 1 month ago and the oil in it was extremely dark, and most likely 3 years old with 2k miles according to the sticker. My first oil change was with super tech syn blend (which I assume used to be their conventional) with a st3614 oil filter (yes I know crappy filter). I put 1500 on this oil and am changing it soon with a 90915 yzzd3 filter I plan to run 4500 oci