Long time lurker. I have a Mazdaspeed 3 that has seen a steady diet of Pennzoil platinum 5w30 or 5w40 euro most of its life, which I’ve been completely satisfied with. However after selling my Ram 1500 I have a few gallon jugs of Redline 5w30 leftover I’m looking to use. To me it looks just as thick as the Pennzoi 5w40. Is there any reason not to run it in the Mazda? I’ve maintained short OCIs of 3k miles.
Thanks!
Thanks!
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