Hello Pitufo2004, it seems to me that 10W 30 oil is correct for your vehicle, the 20W 50 is executively viscoso and can have your vehicle premature wear, remember that the greatest wear of a vehicle is when it turns on it and with a very viscous eczeite it will take longer to lubricate all the engine parts, although I personally recommend that you consult your manual of the owner. Regarding the spark plugs is something that you try but with the calibrated you do not confess as long as you buy new spark plugs check your calibration (just to be safe).
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