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

Answer

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

Answer

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.

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