Story 1: I have been trying to convince myself to switch my Mazdaspeed 3 from the factory recommended 5w-30 to 10w-30. I was looking at the viscocity of various oils today at lunch and noticed that Pennzoil Platinum 10w appears to be thinner than Pennzoil Conventional 5w so how could I go wrong. It seems that I could easily show the spec and validate that it was within factory specification if it ever became a warranty issue. I also noticed that the Mobil 1 High Mileage is really thick stuff. Story 2: Today I changed the oil in my 89 4Runner (engine has about 16k on the rebuild) and opted to switch from Pennzoil Platinum 10w-30 to Maxlife Blend 10w-30 ($14 for a jug). I wanted something a little thicker and since I only managed to squeeze 2,500 miles out of this OCI spending the coin for synthetic doesn't really make sense. Also, the oil pan has a little seep to it because it has a gasket rather than just "goo" like Toyota delivered them. My mechanic said that minor seeping wasn't uncommon when a gasket was used. Ironically, Toyota offers a gasket, but it's not they way they did it. Any thought?