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Hola Pablo. I didn't say I felt I needed to use the 10-w-50 (Castrol GTX non-syn). I was given a case and I just wanted to know if there was any reason not to use it. Could it creat damage to my engines? Warranty is not an issue here. Is this something I should hold off till summer and hot weather?

I have two older autos - '92 Escort and 94 Mazda B-4000, both with over 100,000 miles on the clock. I usually run 10 W 30, but a friend gave me a case of 10 W 50 oil. I live in central Alabama which has mild winters. Is there any significant reason that I shouldn't use the 10 W 50 in either of...