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Last year I put Castrol Syntec 5W-50 in my '02. I'm pretty sure it used to be an approved oil, but now I see that most 5W-50s are off the list. Is this because they don't approve seasonal oils any more based on the text in the document(being so thick I guess)
Should I not use 5W-50 any more? It used to be okay and now it's dangerous? I don't understand how these approvals can change year to year. Is it okay to drive it in hotter weather only(I don't drive in the winter months anyway).
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