ok guys, need to clear one thing up..i spoke to a mate about engine oil. he states that, as a car gets older, or as it becomes more worn and torn, the engine needs thicker oils.
now, he says 5/40- 10/40 and the rest of em are the sorts of oils you would use in brand new cars with out much wear..
i hav been putting penzoil 20 50 in my rb25 and hav had no dramas for the past few years..
now this is my question!!...why is everyone putting such thin oil into these liners, which are 5-15 yrz old now.. should u be putting thicker oils as the kms tick over?
please clarify this, or better improve my understanding. cheers