Short stop and go driving is harder on oil than folks imagine. At least every 6 months. If you use synthetic, 10k and once a year isnt too bad, especially if you also use the recommended MOBIL 1 type hi-efficiency filter. Removes particles 5X smaller out of circulation. And avoid drives under 10 minutes exclusively, if that is your driving environment, then make sure to drive it for at least 30 minutes to hour, on a weekly or monthly basis to get proper operating temps to evaporate any condensation out of it. If not, the acidic engine oil compounds form, oil breaksdown, causes ovarnish/sludge buildup like mad.
But, my custom is to change the first oil in 20 minutes, then 500 miles, and then again at 3000 miles. Then I switch to synthetics after proper breakin. When engine is cold and first started, and ESPECIALLY when NEW or rebuilt, thats when the greatest amount of metal wear particles are formed, which is why the 20 minute-500 mile deal is important. it might make the difference between getting 1-2 mpg better, 5% more power, AND 300K out of a build instead of 150-200k to use quality synthetics. I do build my own engines, and drive many of then over 250-300K. personal record was 360,000 on a FILTERLESS 73aircooled VW superbeetle beetle, and 550 thousand on a 300 cu inch 6 cylinder fin a 61 MERCURY p/u truck. Both are STILL running. It is not recommended to use synthetic until breakin over, due to high lubricity preventing requisite wear to seat moving components, rings, bearings and the like. And despite rumors to the contrary, running synthetic in an old car is not harmful, leaky, or dangerous. BUT if you already have worn out seals seeping oil, then the synthetic "might" leak alittle more, although this is only anecdotal.
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