Just installed K & N air filter, Oil change with K & N oil filter with Royal Purple

Calisun · 06-07-2007, 07:53 PM

Been reading some thread and decide to go with K & N air filter and Royal Purple oil with K & N oil filter. I do not notice much performance difference however, I do hear air sucking in when it hit gas aggressively. I use to use K & N on my older cars and I felt little difference in performance. I will be happy to see some MPG increase by this change. From what I am reading, oil change(royal purple) saves about 1 mpg and K & N air filter also helps 1 mpg... Yes, I did not buy FJ to worry about MPG but more MPG is better. More gas money for OFF ROADING. I get 18.5 mpg before this change. I will keep you guys posted what I get with this change.

**Woodsman** · 06-07-2007, 08:37 PM

Throw on a lift kit and 285s and your gain may disappear. I have heard good things about Royal Purple but, then again, I've heard good things about all synthetics.

**colink1** · 06-07-2007, 09:26 PM

Alrighty! This is the third time today I've heard mention of Royal Purple Synthetic. I've been a Mobil1 guy for at least 10 years, but from what I have heard and read recently, I am seriously considering switching to RP. At $6/qt for MB1, it's not a big stretch at $7/qt for RP. With a possible gain in HP and MPG, what's another $6 dollars (DIY).

Calisun · 06-16-2007, 10:49 AM

Update...

Not much of MPG gain. I use to get 18.5mpg and now I am getting 18.9 mpg. 4x4 AT. Roof rack. I was expecting 2 to 3 mpg improvement by reading thread here. I just went through 1st tank after change. Not sure if I will get more after... I do notice smoother engine and better pick up.