<http://schema.org/articleBody>
" Senior Editor Mike Allen answers readers&amp;#039; car questions.  Q:I have a 2002 Chevy Silverado extenda Cab 4X4 (Black) and live in Northern Ontario Canada, I have tried numerous sealers and waxes with limited results. I pamper my truck. What the best stuff to use to keep my truck looking good and the paint protected? PETER G., CANADA MA: Go to http://meguiars.com/rx/rx_main.asp for an individual prescription.  Q: Got a dodge minivan with a 3.3 liter engine. I changed the oil and tried Quaker State synthetic oil W5-30....It was excellent...I see the gas milage go up...Curious?....Quaker State has w5-20 synthetic oil......What cars use the 20 weight oil?...I was very tempted to try it....though the manual calls for 30 weight....my understanding is less the oil weight, less friction, the faster engine rev, faster you go?....I go up and down I-95 a lot. Would 20 weight be beneficial? MA: I sincerely doubt you can detect any difference in the fuel economy, so you are probably seeing something else changing your fuel economy. You&amp;#039;ve neglected to tell me what year your minivan is. Newer cars are engineered to use the thinner oils. Older cars should stick with thicker oils. Use the grade of oil that the owner&amp;#039;s manual calls for. Q: We own a 2004 Outback Legacy Wagon with a six cylinder engine (H6-3.0 liter), and the owners manual states that we should use an octane rating of 91. The problem with this recommendation is that most gas stations in this area offer octane ratings of 87, 89 and 93. The result is that I&amp;#039;m faced with the choice of either too much octane or not enough. Trying to keep fuel costs in line, I now fill my tank up with the 93 Octane, and when it is half full, I then put in the 89 Octane, then the next time go back to 93 etc. I&amp;#039;m hoping that the average of the two gives me the 91 Octane called for. Can Octane ratings be averaged out like I&amp;#039;m doing? DENNIS HYSKO, JERUSALEM, VERMONT MA: Yes. Q: I have a 2000 Buick Regal silver in color with a light gray leather interior. In various lighting conditions I get a reflection of the top of the dashboard on my windshield that interferes with forward visibility. What can I do to dull the top of the dash or minimize this reflection? Thanks, BOB STERN, MEDIA, PA MA: You don&amp;#039;t need to make the surface duller--you need to make it darker. Velcro a piece of dark cloth up there. I know it&amp;#039;s tacky, but you can at least remove it when the sun isn&amp;#039;t bad. Dashboards should be a dark color. Q: Regarding the Hydro-Gen The Ultimate Fuel Saving Device, I would like to know what you have to say about this invention. I have heard about all the other useless gas saving devises, this one caught my attention. I&amp;#039;m a retired Special Effect Tech. and not exactly unknowledgeable in the mechanical field. ROBERT F. BURNS, OCEAN PARK, WA A: Bogus. Yes, it will produce small amounts of hydrogen, which will burn in the engine. But the extra drag on the alternator to make the electrical current necessary to disassociate the hydrogne and oxygen in water will consume any energy gained from the hydrogen combustion. There are other hydrogen generators on the market besides this one, too. These people have simply ignored the Second Law of Thermodynamics. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.popularmechanics.com/cars/how-to/a528/2528256/>