Re: Royal Purple oil in 2008 ford escape
I tried z-max years ago on an older Spirit. After a year after adding it to the crankcase I changed over to synthetic oil and it made more of a difference than z-max ever did. In my '93 Spirit the oil was jet black at 3000kms (yes km, not miles). I'd change it every 3000kms with regular petrol oil. I flushed the engine with auto-rx, ran it in the crankcase with fresh no name oil for 1500kms and changed it out for Amsoil 5W30 full synthetic. After 6000kms the oil was still clean and I noticed a 3mpg average improvement in mileage up until I sold the vehicle.
I believe regular maintenance has a lot to determine how long components last. I'm sure your Escape has a transmission drain plug for lower cost of regular maintenance. My Dodge 46RE transmission has 12 bolts that I have to take off, scrape off the old RTV sealant and then reapply and torque the bolts accordingly. If I had a drain plug I could perform a transmission oil change in less than fifteen minutes versus the hour and a quarter, including taking the time to let the RTV sealant cure before adding fresh fluid. Change the fluid every 40,000kms and every third change take the pan off and change the filter. By changing the oil sooner you eliminate the need to replace the filter at every fluid change. The dealer knows this, but doesn't advertise it as they get more money (by the hour) by taking the pan off and charging you for a filter you dont' need.
'11 Ram Quad Cab 4x4 SXT 5.7L HEMI (stock); 48,500m
'06 Pontiac G6 GT 3.5L 220hp; 64,000m
'12 Chrysler 200 Limited 3.6L 283hp; 28,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!