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Using 5W-40 on Z's with no oil cooler

If I could remember where I saw the testing I’d post it but they found the thick oil actually increased engine temps which makes a lot of sense as the

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Old 05-18-2021, 10:34 PM   #35 (permalink)
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If I could remember where I saw the testing I’d post it but they found the thick oil actually increased engine temps which makes a lot of sense as the pump has to work harder more pressure through the system. In the end their analysis was use the oil viscosity your engine was speced for. Personally I’ve used amsoil for years and it’s never let me down.
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