Getting back to questions that are "as gay as Clay."
Is there still a recommendation on changing engine oil based on length of time passed. My wife's Civic goes 5-6k before the oil life reading dips below 30%, which is when we change it. This happens about twice per year as she drives about 12k miles. If I start driving her car and only put about 6k miles on it for the year (shorter commute), can I go a full year without changing the oil or should I still do it every 6 months?
Also, looking at purchasing a Mazda CX-9. The 2.5 L, 4 cylinder turbo has quite a bit more getup than I expected from a full size SUV. Much more so than the V6 offered on prior year models and obviously the V6's have worse gas mileage as well. I figured there would be quite a turbo lag but it sure doesn't feel like it to me. I read that Mazda does the following to combat turbo lag.
Quote:
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To combat turbo lag, the engine has what Mazda calls the Dynamic Pressure Turbo System that combines the advantages of variable-vane and twin-scroll turbocharger technologies in one small part. There are three butterfly valves positioned in the exhaust manifold at the entrance to the turbocharger. Below 1620 rpm, these valves are closed, forcing exhaust gases through restricted paths, thereby raising the pulsation energy of the exhaust impacting the turbine wheel (like a thumb over a water hose). At 1620 rpm, when the exhaust volume is large enough, the valves open, and the turbo operates normally.
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