My friend asked me to change the oil on his 94 Cavy, he knows nothing about cars and doesn't have his owner's manual. It is a 4 cylinder. Anyone nkow how much oil I will need for this job?

4.25-4.5 should be fine. it might be a tad above the line but shouldnt be a whole lot. start at 4 and see if it needs a lot more.

Yeah. I was gonna start at 3.8 and go from there.