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15W30, 15W40 in warm weather is what's recomended in your owner's manual. Get it too thick or too thin and flow properties and lubrication characteristics may work against you in protecting your engine. Castrol GTX is fine, just keep your mileage to 3000 max on dino oil. Quaker State is also a good dino oil - these two would top all the specifications charts. (Mileage on your car is too high to switch to synthetic.)
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 David 1998 S70 T5SE // misc mods (mostly lighting) // red calipers // Michelin Pilots 1992 940 GLE//SilverStars//Hella MicroDE
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