Hi VXmike:

___It is not just viscosity on the label but the real item to look for is kinematic viscosity at 100 degrees C. This is the true measure of how much particular oil will help or hinder your fuel economy. I don’t believe your VX would have been spec’ed for 5W-30 way back then but if it was, might I suggest a few quarts of Mobil1 5W-30 Synthetic on your next change? There isn’t an oil brand or type you can find with a lower kinematic viscosity at that weight and it is better for your car if you extend oil changes (7,500 miles max) and for cold starts in particular. It will not however pay for itself in $’s saved at the pump given the small increase in fuel economy you should receive while using it. Longevity wise … There are a heck of a lot more cars running 200,000 miles + under regular oil’s vs. 200,000 + on Mobil1 Synthetic so don’t think it will add much on the longevity front either.

___As a hypermiler, Mobil1 Synthetic and its best in class kinematic viscosity for a given weight goes in all my cars and trucks. That includes 0W-20 in the Insight and 5W-30 in the Corolla, MDX, and Ranger.

___Good Luck

___Wayne R. Gerdes
___Hunt Club Farms Landscaping Ltd.
___Waynegerdes@earthlink.net