Whats a good dyno oil?

[rrhanck78]

Made up my mind to stick with a dyno oil curious to hear what anyone thinks about which brand is the best, was thinking of sticking with pennzoil 5-30 any opions?

[new-nissansDOTcom]

Castrol 5-30 is what our Service Department uses as it is a proven oil.

They said that the Pennzoil is great racing oil as it has many performance additives, but it tends to crystallize and build up over time causing sludge. In racing it doesn't matter as most rebuild their engine every 5000 miles or so.

[smoothTitan]

i really like kendall, think its the gt1 or something like that.

[drags1998]

I think you mean DINO oil NOT DYNO oil!!!!!!! That being said,ANY 5-30 with a rating of SG or better will work for YOU!!!!!! Have a nice day.

[NorCal 4x4]

Originally Posted by drags1998

I think you mean DINO oil NOT DYNO oil!!!!!!! That being said,ANY 5-30 with a rating of SG or better will work for YOU!!!!!! Have a nice day.

I think you mean SL.

SAE 5W-30. 10W-30 or 10W-40 may be used if above 0 degree F (-18C).

[billaku]

FWIW - at the time Exxon, now ExxonMobile, engineer in my workgroup stated of the non-synthetics "Only Exxon and Shell don't break down. They get dirty, but don't break down."

Was stated in large group meeting and I was contract wanting to get on permanent - so didn't ask for basis. Do know a very knowledgable person.

Anyway, for first oil change or two, will be using Shell Rotella T 15w-40 in gallons at Walmart. Wm had two side-by-side. One had 'Heavy Duty' on it, more just-blue label background. Has the CI-4 Plus classification. Didn't notice if other one without 'Heavy Duty' on it had the CI-4 Plus - but already met the spec before the new, additional testing, Sept.01 classification.

Closest Walmart doesn't have Exxon in gallons.
Have been using Exxon 10W-30 in Crown Vic with good results. Started using a few years ago due to engineer's statement.


Some interesting comments from Rotella site:

Houston, Texas, July 20, 2004
Shell ROTELLA® T Records Passing Grades For New API Classification
Recently established by the American Petroleum Institute (API), to enhance the performance standards of the current API CI-4 category, the new (Plus) classification requires qualifying oils to include more stringent soot handling capability (controls oil thickening) and upgraded shear stability control, two strengths Shell ROTELLA T already possesses.


From BobIsTheOilGuy:

Shear stability is a measure of the amount of viscosity an oil may lose during operation. Oil experiences very high stresses in certain areas of the engine such as in the oil pump, cam shaft area, piston rings, and any other areas where two mating surface areas squeeze the oil film out momentarily. Most multigrade engine oils contain special types of additives, called Viscosity Index Improvers, which are composed of very large, viscosity-controlling molecules. As the oil passes through the engine, these molecules are permanently sheared or torn apart over time, causing the additive to lose its viscosity-contributing advantages which reduces the oil's ability to maintain its higher number, i.e. 10W-30.

The higher the spread between the bottom number and the top number the more VI improvers are relied on for maintaining the viscosity. Better to keep the numbers closer.

Synth Oils do not rely as much on special Viscosity Index Improver additives and will experience little permanent viscosity loss.


Sounds like viscosity spread something, though much less, to consider with synthetics also - maybe more so in extreme climates, seasons.

Have (synthetic) AMSOil 10W-30 on hand for third or so oil change.

...

[pagerdaddy]

I switched from Castrol to Havoline. $5 a case cheaper at Walmart.

Steve

[billaku]

Some Rotella T stories.