The standards for conventional oil are so stringent that as long as you are using the correct grade of oil, as long as it has the "starburst label," you can't go wrong with buying the least expensive brand you can find. I have never yet used synthetic oil, and I have never had an engine-wear related engine issue. The only reason I would switch to a synthetic, if the price was reasonable, would be to get 0W30, which is optionally called for in the Lexus. Even so, I suspect the fuel savings would not cover the additional cost.
Originally Posted by marvinstockman
I change the oil at least 6 times a year. I'm not saving $30, I'm saving $90. As they say, "Pretty soon you're talking about real money." I haven't seen where the additional cost of synthetic is justified, and until I do, I'm sticking to buying the cheapest conventional oil (using the correct specified grade, and with the starburst label, of course), and a 5000-mile interval. 3000 miles is fine if you feel you must, but too much work for me, for negligible benefit.
2005 Dodge Grand Caravan SXT, 129K mi.
Former owner of:
1988 Dodge Caravan SE, 2.5L I4 (1988-1995, 99K mi); 1995 Plymouth Grand Voyager SE "Rallye", 3.3L (1995-2004, 169K mi); 2003 Grand Caravan Sport, 3.8L, (2004-2008, 106K mi), 2008 Nissan Quest, (2008-2010, 25K mi)
2008 Lexus RX400h (Dark Gray), 112K mi; 2005 Hyundai Elantra GT (Blue), 89K mi