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Chevron Delo 400 15w-40 On Sale for Costco Members


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@bbruzzese I have used Mobil Delvac in my '97 PS 190 before because it was available in my local auto parts store and checked all the boxes for an old engine with flat tappets. I don't actually even know what "flat tappets" means, but apparently when your engine has that it is good to use an oil with a high zinc content, which the Delvac apparently does.
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