10W-40 Oil instead of 5W-40 | Technical matters | Back Room Forum | Honest John
10W-40 Oil instead of 5W-40 - Yoby Not sure whether I can say on this forum, but National Tyres, where the Oil change is a lot cheaper than doing it myself! Have just checked the Haynes manual which says that 5W/30, 5W/40 or 10W/40 is all fine. The engine...
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