Ok my next oil change is coming up in another 1k miles for my 04 Civic. I have several options to choose from. First option is to use the several quarts of the German Syntec 0w-10, but I was affraid it my might be too thick for my 1.7 liter engine. Opinions on that? Or should I run a thinner oil with a quart of Syntec? Since I only do my own oil changes on my car I have to use the Syntec in my car in some shape. Then I also have several quarts of Pennzoil Platinum 5w30. And my third option is to use the half quarts of different brands of leftover oils and run it for 3k. If I'm going to use the Syntec or the Platinum I will run 5k+ miles. Right now I've been running the oils for 5k which usually equates to six months. Thanks