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If your engine is marked 'use 5W30 oil only' could using 10W40 cause any engine problems?


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Answered 2015-07-16 18:03:47

5W30 is a viscosity rating, In simple terms resistance to flow. 10W40 is a thicker oil in extreem winter climate you could experience hard stating.If you use a synthetic or partially sythetic oil you will be better off.

i tried it in my 95 Monte Carlo 99,000 miles.it triggered service engine light to come on.going tomorrow to put 5w30 back in it.

In newer model vehicles it is important to use the correct viscosity oil because the engine has been made to properly flow oil of a specified weight. I've seen heavier oil put in new vehicles by ignorrant techs. and the oil can not make its way to lubricate the valves and wears a good motor fast. If you hear ticking noises you better change with new oil qiuckly and hopes the motor runs smooth again.

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