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It's not valve train, it is a bottom end sound. Oil gauge is a good idea, but I don't have one. That makes sense and perhaps the heavier oil suggested above may help this out.

Thanks, will try the HM on the next OCI.

I'll try the PCV valve, but that, I think, would be a miracle too!

How is this different than the Castrol GTX 10W-30 thats in there now?

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...

Just bought it, no past history available.

Ford is pretty specific about using the 5W-20, they mark about everywhere in the manual and engine compartment. I think I'll stick with their recommendation. But the Havoline sounds great!

I hadn't decided on an OCI as yet. Most likely, I'll shoot for 5K miles, or about every 10 weeks. I am not comfortable going much further than 5K on oil, that's why I don't think syn-blend or synthetic makes sense. Car has 40K miles on it, of which, I put on the last 4K.

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...