| It states on RP's site that "Synchromax is recommended for manual transmissions that specify an automotive transmission fluid or motor oil." But yet on their transmission lubricant chart it has: Manual Transmission / Transaxle (API GL-3: 75W90, 80W90) -> SAE 10W40 / XPR 10W40 A friend has a couple quarts of this and is wondering if it will help with his tranny grind like the Redline. I was going to say no, but their recommending regular motor oil for a tranny normally using 75W90 threw me off. To me 10W40 and 75W90 are way different, but I'm not a motor-oil-ologist. Royal Purple's Transmission charts
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