Hello: I use the K&N Air and Oil filter, they are both great products. The Prolong Oil treatment is also a good thing to protect the engine from the hars temperatures it faces. Castrol, Mobil 1 are great oils. Lucas Oil stabilizer are great also, I use all of them in my Lex. Changed it every 5,000 miles as the book says and Mobil 1 sells an oil for that type of oil change. A cousing of mine used Castrol and his car lasted him over 30 plus years until he sold it. Rebuilt the engine twice, after using Prolong never had to adjust valves again, before had to do it once a year. I am not receiving any money or anything from any of this products, want to put that clear. Had a Mitsubishi Diamante with over 220,000 miles on the engine with prolong on it using K &N Filters.
C. PR
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Castrol is a top brand. I've been using it exclusively since the 1960's. I use the Castrol synthetic blend now in my IS.
Castrol had the first 2 stroke oil that didn't gum up the motors and exhausts on motorcycles. The original had a castor bean base and gave a "different" odor at the race tracks, but it sure did work.