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10w30

actually these engines do much better on a full synthetic 5w30.

depending on the mileage you want to run thicker oil to take up the worn 'play' in the motor, especially in warmer climates and the summer months. i use 3 quarts (give or take) of valvoline full synthetic (10w30) and one whole quart of lucas oil stablizer (non-synthetic). the lucas oil stablizer works wonders for the motor, i highly recomend that product.On older engines dont use synthetic.Castrol 10 w 30 is best choice.Slick 50 will help but not often.I have always used castrol from day one;that was 25 years ago.Engine is still going.

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13y ago
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