Good morning everyone. I would like to ask you guys what you think about Royal Purple Synthetic oil. The local auto supply store in my area carries this in 15w-40 but he recommends Redline synthetic oil but that brand does not have 15w-40. I can't find Mobil Delvac1 here in the BayArea. Hope to hear from you guys soon so I can make my decision. Thanks in advance.

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96 Legacy LSi wagon
92 Mitsu Expo
95 525iT
1983 300TD clackclackclack sold
1972 Toyota Corolla wagon TE28 sold
1991 Galant VR4 pshhhhh non-op
1989 Montero RS pop's ride