Let me first say how happy I am to have found you guys! The knowledge here is Impressive! I have just finished reading over 2hrs of posts concerning oils, (more to read). Now for the help needed part. I own a 2002 Tacoma 4x4 with a 2.7L 4cyl. At the first 2800 miles I started a switch to synthetic of blending Castrol Syntec 5w30 with Castrox GTX 5w30. Now I have almost 9000 mi on the vehicle and on the last oil change used 2 qts dino and 3 qts Syntec. This upcoming change I was ready to go full Syntec, but stumbled up this board and now am very confused. Now I change my oil every 3000-3500 miles and use a Mobil 1 filter. The questions are is the Syntec going to really do me any good? Should I go with another synthetic oil? Is GTX sufficient with the change intervals I use? This is a kinda what would you educated oil people do in my shoes kinda question. Most of my miles are highway with some off road miles thrown in. I keep my vehicles for many years. Last Toyota truck 130,000 miles, 4Runner(wifes) still runnin strong with 160,000 mi. I'm more educated now but also more confused!!! I'll go back to readin now and shut up, Thanks for any replies it will be apreciated!