Anyone use HD 30 in summer?

[y_p_w]

quote:

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Originally posted by KJA426:
I've been using mostly Pennzoil with the occasional dose of Castrol. I noticed the last batch of Pennzoil 30 was still SL rated so I assume it has the higher levels of zinc and phosphorous.

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Not necessarily. It may have been their latest SM formula sold before they were licensed to label it as such.

I used to be under the impression that SAE 30 had to be (by definition) a Group I oil. However - Pennzoil labels HD-30 as using "PureBase" (Group II) and the only viscosity requirement is that it meets 30 weight at 100°C.

 

[y_p_w]

quote:

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Originally posted by Blue99:
Here's a temperature chart to compare start up temperatures of 5W-30 to SAE 30. Note that a start-up with SAE 30 at 70F is the same viscosity as 5W-30 at about 55 degrees.

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I think a lot of the modern Group II based heavy duty "single weight" oils could probably be classified as multiweight. 15W-30 and 20W-30 are listed as SAE weights on the API website, but they don't have any currently licensed versions. I'd be curious to see a viscosity curve for an older Group I based SAE 30 oil and find out how much thicker one would be at colder temps.

Besides - what is a "single weight heavy duty oil" really? My impression is that by definition it means no VI improver.

 

[Blue99]

Well, that's a good point, ypw.

The Chev/Havoline SAE 30 has a 108 VI index for the finished oil that probably reflects usage of the Chevron Grp II base oils with a VI of 105-110.

 

[1maniac]

Doesnt fit mine either

 

[MattBrew]

quote:

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Originally posted by JeepZJ4.0:
My friend uses 30 straight weight year round. His Jeep hit 177K of hard driving before he changed the rings. He had an oil burning problem.

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those results tell me that he should have used something else.

200k is fairly typical with 0 internal work on that engine

 

[mechtech]

I want as thin as possible at start up, whether it's 0F or 90F outside.
That's why the 0and5-30s sound good to me.

 

[Steve S]

The SAE viscosity chart recommend a straight 30 to 30 degrees f so for summer use 30 will be no problem.

 

[Islandvic]

My brother's '95 Z-71 w/ 5.7 was getting regular 4-5k mile OCI's with Quaker State 30wHD at his trusted local service shop year round (South Texas where it may freeze twice a year never going below 30 degrees).

Now he's on 10-30 ValMaxLifeSyn (from my AZ $2/qt stash) and Wix filters.

He never had lubed parts fail so far.