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In the old days, the guideline was to change transmission fluid every three years, or 30,000 miles, whichever came first. Your best bet on newer vehicles, according to both Hogarty and LeBlanc is to see what the manufacturer recommends. Some transmissions need regular maintenance, and others are dubbed a "lifetime fill" and can go up to 150,000 miles between oil changes. "When in doubt, service the transmission with OEM fluid and filter starting at 60k, and every 30k afterwards," Motor Oil "It's most important to check your oil regularly," Hogarty says. "Low oil level is far worse than not meeting some kind of regular interval." The intervals he suggests for car motor oil changes are 5,000 miles for synthetic blends and 10,000 miles for full synthetic. Hogarty also recommends the synthetic blend to customers, so that they can get their tires rotated with every oil change. LeBlanc sticks by an old standard, suggesting that the rule of thumb for oil change intervals is 3,000 miles for conventional oils and 5,000 miles for synthetics.

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