About 6 months ago I got a Honda Ridgeline, with the 3.5 engine. Yesterday, I got the wife a new RX350 with the 3.5 engine,, are they the same? I will change the oil around 1,500 to 2,000 miles in the RX, and then every 5,000 miles, I change it in the truck every 5,000 miles also.