The caveat, however, is that in newer Corvettes (C4-5-6) you must use synthetic oil because their engines were designed specifically to run at the higher temperatures only synthetics can tolerate without breaking down and losing viscosity. That's why Mobil 1 5w30 Synthetic has been the factory-fill oil in Corvettes since 1992. Remember what we said earlier about heat being the #1 enemy of oil? Synthetics are engineered to handle heat much better than petroleum-based oils can. There's another myth that synthetic oils last forever, and this is a BIG untruth; no oil lasts forever, period. While synthetics do have a longer usable lifespan than conventional petroleum-based oils, they have to be changed at regular intervals, too, although some brands (e.g., MPT Thirty-K), claim intervals of 15-30K miles before oil changes, depending on your driving style. And every time you change the oil you should also change the filter; not doing so is kind of like taking a shower and putting your dirty, sweaty socks back on your feet – that defeats the purpose of it all, doesn't it? The choice of oil and filter brand is entirely up to you, but stick with the premium name brands to be on the safe side. You've Corvette is an investment, so why be penny-wise and dollar-foolish when it comes to the oil and filter? We always prefer to err on the side of caution, which is why we use magnetic oil drain plugs on all of our company- and staff-owned Corvettes in addition to filter magnets. The purpose of these magnet plugs is to trap and hold any stray ferrous particles that may be lurking inside the motors and keep them from circulating and causing damage internally. Again, these devices only cost a few dollars and they are well worth the added insurance – and peace of mind – they can give you. THREE GENUINE GAS SAVING TIPS TIP #1 - Only buy or fill up your car or truck in the early morning when the ground temperature is still cold. Remember that all service stations have their storage tanks buried below ground. The colder the ground the more dense the gasoline, when it gets warmer gasoline expands, so when buying in the afternoon or in the evening, your gallon is not exactly a gallon. In the petroleum business, the specific gravity and the temperature of the gasoline, diesel and jet fuel, ethanol and other petroleum products plays an important role. A 1° rise in tem- perature is a big $$ deal in the fuel business. But, alas, the service stations do not have temperature compen- sation at the pumps – that's why you should select the time of day to gas up when Nature can help you out. TIP #2 - And when you're filling up do not squeeze the trigger of the nozzle to a fast mode. If you look you will see that the trigger has three stages: low, middle, and high. In slow mode you should be pumping on low speed, thereby minimizing the vapors that are created while you are pumping. All hoses at the pump have a vapor return. If you are pumping on the fast rate, some of the liquid that goes to your tank becomes vapor. These vapors get sucked up and back into the underground storage tank so you're getting less worth for your money. TIP #3 - One of the most important tips is to fill up when your gas tank is half full or half empty. The reason for this is, the more gas you have in your tank the less air occupying its empty space. Gasoline evaporates faster than you can imagine. Gasoline storage tanks have an internal floating roof which serves as zero clearance between the gas and the atmosphere, minimizing evaporation. Your Corvette's gas tank doesn't have a floating roof, but you can use the remaining fuel to mimic this function - at least partially!
The FilterMag is a heavy-duty reusable magnet that simply sticks right onto the side of your oil filter. Log onto www.filtermag.com and enter the year, make and model of your Corvette to see which models are right for you, then  choose whether you want the standard, SS or heavy-duty model.