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Re: Oils for older vehicles and new engine break in
Posted to Castrol Forum on 6/6/2017 15 Replies

Hi Glenn

Happy to hear of your success with GTX 20W-50. With regards to the 5W classification, this is the low temperature performance description for multigrade engine oils with the lower the number the better the low temperature oil flow and pumpability. S... Login to read more.

15 Replies Received (View Replies)