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Our 2000 Windstar SEL 3.8L (53K miles) has started making a knocking sound only while idling and only when really warmed up in higher ambient temps (over 75C). Used Castrol GTX 5W-30 last change and sound is better, but weather is also cooler. Is there a better choice to use? This a well known...

Ready for my first oil change in my 04' Sable LS with the 24V Duratec engine. Sounds like I need to use 5W-20. Which is the best value vs. quality for this? Car does 400-500 highway miles per week. Do not want to use synthetic as with frequency I will be changing (every 8 - 10 weeks), its too...

So I know I need to get the M1 10W-30 out of my LS-1, but just did it, too expensive to pour away. I'll wait 6K miles then, M1 5W-40 Truck & SUV OR M Ext Perf. 10W-40 Car has 77K miles on it, live in Tampa for weather consideratios. Thanks Guys!

Sorry if this has been posted and beaten to death before, but I am new to the forum. I have an 00' WS6 with an LS-1 which has 77K miles on it. I just put in M1 10W-30 as Walmart had NOTHING else in 5 quart jug! What is the best brand, weight, and miles you would suggest using? I put 350 - 400...