Is 5W 30 only for newer engines?

[Trav]

In extremely cold weather it can take a while to open.If the engine doesn't overheat and the the heater is working well i wouldn't be concerned.Check the temp of the coolant as its warming up,if theres a steady rise in temp as the thermostat begins to open and reaches full temp its fine.A more exact test can be made with it removed.

 

[Doc8404]

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Stick with the 10w30 .....

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in CA, i'm sure 10W30, motorcraft blend, will be fine.

 

[Vilan]

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Well, he finally relented, and agreed to use 5W30, but had to have someone go and pick it up.

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What kind of garage doesn't even have 5W30 in stock?

 

[Cogito]

I was thinking the same thing. I think this guy really believes that 10W30 is OK in the winter and shouldn't be used in older cars, and talks people into using it if they ask for 5W30. He almost had me convinced, and I knew better!

 

[surfstar]

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Well, he finally relented, and agreed to use 5W30, but had to have someone go and pick it up.

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What kind of garage doesn't even have 5W30 in stock?

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California garages.

 

[Zaedock]

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Of course its a concern,Read up on the effects of low ZDDP content on flat tappets.

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A few million Jeep 2.5L's and 4.0L's with flat tappets (non-adjustable to boot) seem to be doing just fine.