- Is it typical to replace both the primary (inline) and secondary (cannister) filters at the same time?
- What is the recommended time between changes for each or both?
- My car is a 1979 but when I ask for a 1979 model secondary filter I'm given the wrong one (an internal filter more like the oil filter). Apparently my engine takes the 1980 and later version (the spin on cannister type). Was the switch made mid-year, or did my car have an engine swap? Any idea?
Thanks, Steve