After 3 Auto-RX treatments on my 165k mile Saturn I decided to go for a good non-synthetic oil. I ended up getting Mobil Delvac 1300 Super. When I first got this car and tried a 10w40 oil in it(with a fram x2 filter incodentally) the engine made a funny high pitched sound which I contributed to the weight of the oil. I then discovered auto-rx. I've since run 3 treatments of the RX including one on Castrol GTX 10w40 and Mobil1 0w40. Ever since the cleaning the engine no longer makes the noise with the 40wt oils. There seems to be no issue with the 15w40 in the saturn(at least in this weather). But, I'll probably go D1 for the winter since it's better with the cold temps. I'll try to get a sample of this stuff sent out after 3-4k miles or so to see how it does and if I can extend the interval some.
At any rate, my car seems to run well on the Delvac 1300S 15w40 oil.
--Matt
At any rate, my car seems to run well on the Delvac 1300S 15w40 oil.
--Matt