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Illinois | Yeah I know. That's what gets me confused.
For a semi transmission that needs 50 weight oil does it need SAE 50 or would 15w50 work better for cold mornings? Can the two oils be interchanged in this case?
Also what is hygard or other transmission oils? Some gearboxes call for hygard and some want 80w90 or equivalent.
Then there's synthetic vs Dino oil....
Edit I know that 15w40 and 80w90 are very different but they rank similar to each other on the chart above
Edited by AGDEAL 2/11/2019 20:43
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